diff --git a/CHANGELOG.md b/CHANGELOG.md
index 29b390ea..bcab28ab 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
  * replace
  * upsert
 
+### Changed
+
+* `checks` is disabled for internal functions by default
+
 ## [0.1.0] - 2020-09-23
 
 ### Added
diff --git a/crud-scm-1.rockspec b/crud-scm-1.rockspec
index 15b713d3..39dba507 100644
--- a/crud-scm-1.rockspec
+++ b/crud-scm-1.rockspec
@@ -8,7 +8,7 @@ source  = {
 dependencies = {
     'tarantool',
     'lua >= 5.1',
-    'checks == 3.0.1-1',
+    'checks == 3.1.0-1',
     'errors == 2.1.3-1',
     'vshard == 0.1.16-1',
 }
diff --git a/crud/common/call.lua b/crud/common/call.lua
index 19a95bc7..2c16e51c 100644
--- a/crud/common/call.lua
+++ b/crud/common/call.lua
@@ -1,8 +1,8 @@
-local checks = require('checks')
 local fiber = require('fiber')
 local vshard = require('vshard')
 local errors = require('errors')
 
+local dev_checks = require('crud.common.dev_checks')
 local registry = require('crud.common.registry')
 local utils = require('crud.common.utils')
 
@@ -23,7 +23,7 @@ local DEFAULT_VSHARD_CALL_TIMEOUT = 2
 --
 function call.init()
     local function call(opts)
-        checks({
+        dev_checks({
             func_name = 'string',
             func_args = '?table',
         })
@@ -63,7 +63,7 @@ local function call_on_replicaset(replicaset, channel, vshard_call, func_name, f
 end
 
 local function call_impl(vshard_call, func_name, func_args, opts)
-    checks('string', 'string', '?table', {
+    dev_checks('string', 'string', '?table', {
         timeout = '?number',
         replicasets = '?table',
     })
diff --git a/crud/common/checkers.lua b/crud/common/checkers.lua
deleted file mode 100644
index 4881a427..00000000
--- a/crud/common/checkers.lua
+++ /dev/null
@@ -1,46 +0,0 @@
-require('checks')
-
-function _G.checkers.funcs_map(p)
-    if type(p) ~= 'table' then
-        return false
-    end
-
-    for func_name, func in pairs(p) do
-        if type(func_name) ~= 'string' then return false end
-        if type(func) ~= 'function' then return false end
-    end
-
-    return true
-end
-
-function _G.checkers.strings_array(p)
-    if type(p) ~= 'table' then
-        return false
-    end
-
-    for i, str in pairs(p) do
-        if type(i) ~= 'number' then return false end
-        if type(str) ~= 'string' then return false end
-    end
-
-    return true
-end
-
-function _G.checkers.update_operations(p)
-    if type(p) ~= 'table' then
-        return false
-    end
-
-    for i, operation in pairs(p) do
-        if type(i) ~= 'number' then return false end
-        if type(operation) ~= 'table' then return false end
-        if #operation ~= 3 then return false end
-
-        if type(operation[1]) ~= 'string' then return false end
-        if type(operation[2]) ~= 'number' and type(operation[2]) ~= 'string' then
-            return false
-        end
-    end
-
-    return true
-end
diff --git a/crud/common/dev_checks.lua b/crud/common/dev_checks.lua
new file mode 100644
index 00000000..334457e8
--- /dev/null
+++ b/crud/common/dev_checks.lua
@@ -0,0 +1,9 @@
+local checks = require('checks')
+
+local dev_checks = function() end
+
+if os.getenv('DEV') == 'ON' then
+    dev_checks = checks
+end
+
+return dev_checks
diff --git a/crud/common/heap.lua b/crud/common/heap.lua
index 6ec66047..4427642c 100644
--- a/crud/common/heap.lua
+++ b/crud/common/heap.lua
@@ -1,12 +1,10 @@
-local checks = require('checks')
-
-require('crud.common.checkers')
+local dev_checks = require('crud.common.dev_checks')
 
 local Heap = {}
 Heap.__index = Heap
 
 function Heap.new(opts)
-    checks({
+    dev_checks({
         comparator = 'function',
     })
 
@@ -45,7 +43,7 @@ function Heap:_ok(child_idx, parent_idx)
 end
 
 function Heap:add(obj, meta)
-    checks('table', '?', '?')
+    dev_checks('table', '?', '?')
 
     local node = {
         obj = obj,
diff --git a/crud/common/registry.lua b/crud/common/registry.lua
index 5301e469..6beb7cbb 100644
--- a/crud/common/registry.lua
+++ b/crud/common/registry.lua
@@ -1,8 +1,5 @@
-local checks = require('checks')
 local errors = require('errors')
 
-require('crud.common.checkers')
-
 local registry = {}
 
 local registered_funcs = {}
@@ -17,8 +14,6 @@ local RegisterError = errors.new_class('Register')
 -- Should be passed as a {string: function} map.
 --
 function registry.add(funcs)
-    checks('funcs_map')
-
     for func_name in pairs(funcs) do
         if registry.is_registered(func_name) then
             return nil, RegisterError:new("Function %s is already registered", func_name)
diff --git a/crud/common/utils.lua b/crud/common/utils.lua
index 8c06c8c9..8c94b3a1 100644
--- a/crud/common/utils.lua
+++ b/crud/common/utils.lua
@@ -1,6 +1,7 @@
-local checks = require('checks')
 local errors = require('errors')
 
+local dev_checks = require('crud.common.dev_checks')
+
 local FlattenError = errors.new_class("FlattenError", {capture_stack = false})
 local UnflattenError = errors.new_class("UnflattenError", {capture_stack = false})
 local ParseOperationsError = errors.new_class('ParseOperationsError',  {capture_stack = false})
@@ -8,7 +9,7 @@ local ParseOperationsError = errors.new_class('ParseOperationsError',  {capture_
 local utils = {}
 
 function utils.table_count(table)
-    checks("table")
+    dev_checks("table")
 
     local cnt = 0
     for _, _ in pairs(table) do
@@ -19,7 +20,7 @@ function utils.table_count(table)
 end
 
 function utils.format_replicaset_error(replicaset_uuid, msg, ...)
-    checks("string", "string")
+    dev_checks("string", "string")
 
     return string.format(
         "Failed for %s: %s",
diff --git a/crud/delete.lua b/crud/delete.lua
index ad353bfc..83df7e7b 100644
--- a/crud/delete.lua
+++ b/crud/delete.lua
@@ -5,6 +5,7 @@ local vshard = require('vshard')
 local call = require('crud.common.call')
 local registry = require('crud.common.registry')
 local utils = require('crud.common.utils')
+local dev_checks = require('crud.common.dev_checks')
 
 local DeleteError = errors.new_class('Delete',  {capture_stack = false})
 
@@ -13,7 +14,7 @@ local delete = {}
 local DELETE_FUNC_NAME = '__delete'
 
 local function call_delete_on_storage(space_name, key)
-    checks('string', '?')
+    dev_checks('string', '?')
 
     local space = box.space[space_name]
     if space == nil then
diff --git a/crud/get.lua b/crud/get.lua
index a0311909..d1f43706 100644
--- a/crud/get.lua
+++ b/crud/get.lua
@@ -5,6 +5,7 @@ local vshard = require('vshard')
 local call = require('crud.common.call')
 local registry = require('crud.common.registry')
 local utils = require('crud.common.utils')
+local dev_checks = require('crud.common.dev_checks')
 
 local GetError = errors.new_class('Get',  {capture_stack = false})
 
@@ -13,7 +14,7 @@ local get = {}
 local GET_FUNC_NAME = '__get'
 
 local function call_get_on_storage(space_name, key)
-    checks('string', '?')
+    dev_checks('string', '?')
 
     local space = box.space[space_name]
     if space == nil then
diff --git a/crud/insert.lua b/crud/insert.lua
index c79a00bd..ad7b3b5e 100644
--- a/crud/insert.lua
+++ b/crud/insert.lua
@@ -5,8 +5,7 @@ local vshard = require('vshard')
 local call = require('crud.common.call')
 local registry = require('crud.common.registry')
 local utils = require('crud.common.utils')
-
-require('crud.common.checkers')
+local dev_checks = require('crud.common.dev_checks')
 
 local InsertError = errors.new_class('Insert',  {capture_stack = false})
 
@@ -15,7 +14,7 @@ local insert = {}
 local INSERT_FUNC_NAME = '__insert'
 
 local function call_insert_on_storage(space_name, tuple)
-    checks('string', 'table')
+    dev_checks('string', 'table')
 
     local space = box.space[space_name]
     if space == nil then
diff --git a/crud/replace.lua b/crud/replace.lua
index 9f830288..b151e5f1 100644
--- a/crud/replace.lua
+++ b/crud/replace.lua
@@ -5,8 +5,7 @@ local vshard = require('vshard')
 local call = require('crud.common.call')
 local registry = require('crud.common.registry')
 local utils = require('crud.common.utils')
-
-require('crud.common.checkers')
+local dev_checks = require('crud.common.dev_checks')
 
 local ReplaceError = errors.new_class('Replace', { capture_stack = false })
 
@@ -15,7 +14,7 @@ local replace = {}
 local REPLACE_FUNC_NAME = '__replace'
 
 local function call_replace_on_storage(space_name, tuple)
-    checks('string', 'table')
+    dev_checks('string', 'table')
 
     local space = box.space[space_name]
     if space == nil then
diff --git a/crud/select.lua b/crud/select.lua
index b1cdd4ae..2585b3e5 100644
--- a/crud/select.lua
+++ b/crud/select.lua
@@ -5,6 +5,7 @@ local vshard = require('vshard')
 local call = require('crud.common.call')
 local registry = require('crud.common.registry')
 local utils = require('crud.common.utils')
+local dev_checks = require('crud.common.dev_checks')
 
 local select_conditions = require('crud.select.conditions')
 local select_plan = require('crud.select.plan')
@@ -14,8 +15,6 @@ local select_filters = require('crud.select.filters')
 
 local Iterator = require('crud.select.iterator')
 
-require('crud.common.checkers')
-
 local SelectError = errors.new_class('SelectError')
 local GetReplicasetsError = errors.new_class('GetReplicasetsError')
 
@@ -26,7 +25,7 @@ local SELECT_FUNC_NAME = '__select'
 local DEFAULT_BATCH_SIZE = 100
 
 local function call_select_on_storage(space_name, index_id, conditions, opts)
-    checks('string', 'number', '?table', {
+    dev_checks('string', 'number', '?table', {
         scan_value = 'table',
         after_tuple = '?table',
         iter = 'number',
@@ -73,7 +72,7 @@ function select_module.init()
 end
 
 local function select_iteration(space_name, plan, opts)
-    checks('string', '?table', {
+    dev_checks('string', '?table', {
         after_tuple = '?table',
         replicasets = 'table',
         timeout = '?number',
@@ -118,8 +117,8 @@ local function get_replicasets_by_sharding_key(sharding_key)
 end
 
 local function build_select_iterator(space_name, user_conditions, opts)
-    checks('string', '?table', {
-        after = '?',
+    dev_checks('string', '?table', {
+        after = '?table',
         limit = '?number',
         timeout = '?number',
         batch_size = '?number',
@@ -205,7 +204,7 @@ end
 
 function select_module.pairs(space_name, user_conditions, opts)
     checks('string', '?table', {
-        after = '?',
+        after = '?table',
         limit = '?number',
         timeout = '?number',
         batch_size = '?number',
@@ -242,7 +241,7 @@ end
 
 function select_module.call(space_name, user_conditions, opts)
     checks('string', '?table', {
-        after = '?',
+        after = '?table',
         limit = '?number',
         timeout = '?number',
         batch_size = '?number',
diff --git a/crud/select/conditions.lua b/crud/select/conditions.lua
index 55973355..17396b6c 100644
--- a/crud/select/conditions.lua
+++ b/crud/select/conditions.lua
@@ -1,6 +1,7 @@
-local checks = require('checks')
 local errors = require('errors')
 
+local dev_checks = require('crud.common.dev_checks')
+
 local ParseConditionError = errors.new_class('ParseConditionError')
 
 local conditions = {}
@@ -22,19 +23,10 @@ local tarantool_iter_by_cond_operators = {
     [conditions.operators.GE] = box.index.GE,
 }
 
-function _G.checkers.condition_operator(p)
-    for _, op in pairs(conditions.operators) do
-        if op == p then
-            return true
-        end
-    end
-    return false
-end
-
 local function new_condition(opts)
-    checks({
-        operator = 'condition_operator',
-        operand = 'string|strings_array',
+    dev_checks({
+        operator = 'string',
+        operand = 'string|table',
         values = '?',
     })
 
@@ -67,7 +59,7 @@ local cond_operators_by_func_names = {
 for func_name, operator in pairs(cond_operators_by_func_names) do
     assert(operator ~= nil)
     conditions.funcs[func_name] = function(operand, values)
-        checks('string|strings_array', '?')
+        dev_checks('string|table', '?')
         return new_condition({
             operator = operator,
             operand = operand,
diff --git a/crud/select/executor.lua b/crud/select/executor.lua
index c7045b38..eaa5008b 100644
--- a/crud/select/executor.lua
+++ b/crud/select/executor.lua
@@ -1,7 +1,7 @@
-local checks = require('checks')
 local errors = require('errors')
 local log = require('log')
 
+local dev_checks = require('crud.common.dev_checks')
 local select_comparators = require('crud.select.comparators')
 
 local utils = require('crud.common.utils')
@@ -37,9 +37,9 @@ local function scroll_to_after_tuple(gen, space, scan_index, iter, after_tuple)
 end
 
 function executor.execute(space, index, filter_func, opts)
-    checks('table', 'table', 'function', {
+    dev_checks('table', 'table', 'function', {
         scan_value = 'table',
-        after_tuple = '?cdata|table',
+        after_tuple = '?table',
         iter = 'number',
         limit = '?number',
     })
diff --git a/crud/select/filters.lua b/crud/select/filters.lua
index 86e517b1..88020baa 100644
--- a/crud/select/filters.lua
+++ b/crud/select/filters.lua
@@ -1,13 +1,13 @@
-local checks = require('checks')
 local json = require('json')
 local errors = require('errors')
 
-local ParseConditionsError = errors.new_class('ParseConditionsError', {capture_stack = false})
-local GenFiltersError = errors.new_class('GenFiltersError', {capture_stack = false})
-
+local dev_checks = require('crud.common.dev_checks')
 local collations = require('crud.common.collations')
 local select_conditions = require('crud.select.conditions')
 
+local ParseConditionsError = errors.new_class('ParseConditionsError', {capture_stack = false})
+local GenFiltersError = errors.new_class('GenFiltersError', {capture_stack = false})
+
 local filters = {}
 
 --[[
@@ -104,7 +104,7 @@ local function get_index_by_name(space_indexes, index_name)
 end
 
 local function parse(space, conditions, opts)
-    checks('table', '?table', {
+    dev_checks('table', '?table', {
         scan_condition_num = '?number',
         iter = 'number',
     })
@@ -585,7 +585,7 @@ local function compile(filter_code)
 end
 
 function filters.gen_func(space, conditions, opts)
-    checks('table', '?table', {
+    dev_checks('table', '?table', {
         iter = 'number',
         scan_condition_num = '?number',
     })
diff --git a/crud/select/iterator.lua b/crud/select/iterator.lua
index ace0e73f..7fb3309e 100644
--- a/crud/select/iterator.lua
+++ b/crud/select/iterator.lua
@@ -1,11 +1,9 @@
-local checks = require('checks')
 local errors = require('errors')
 local fiber = require('fiber')
 
+local dev_checks = require('crud.common.dev_checks')
 local utils = require('crud.common.utils')
 
-require('crud.common.checkers')
-
 local UpdateTuplesError = errors.new('UpdateTuplesError')
 local GetTupleError = errors.new('GetTupleError')
 
@@ -15,7 +13,7 @@ local Iterator = {}
 Iterator.__index = Iterator
 
 function Iterator.new(opts)
-    checks({
+    dev_checks({
         space_name = 'string',
         space_format = 'table',
         comparator = 'function',
diff --git a/crud/select/plan.lua b/crud/select/plan.lua
index b0dda67a..6319b623 100644
--- a/crud/select/plan.lua
+++ b/crud/select/plan.lua
@@ -1,7 +1,7 @@
-local checks = require('checks')
 local errors = require('errors')
 
 local select_conditions = require('crud.select.conditions')
+local dev_checks = require('crud.common.dev_checks')
 
 local select_plan = {}
 
@@ -85,7 +85,7 @@ local function extract_sharding_key_from_scan_key(scan_key, scan_index, sharding
 end
 
 function select_plan.new(space, conditions, opts)
-    checks('table', '?table', {
+    dev_checks('table', '?table', {
         limit = '?number',
     })
     conditions = conditions ~= nil and conditions or {}
diff --git a/crud/update.lua b/crud/update.lua
index 9dded443..5810435e 100644
--- a/crud/update.lua
+++ b/crud/update.lua
@@ -5,8 +5,7 @@ local vshard = require('vshard')
 local call = require('crud.common.call')
 local registry = require('crud.common.registry')
 local utils = require('crud.common.utils')
-
-require('crud.common.checkers')
+local dev_checks = require('crud.common.dev_checks')
 
 local UpdateError = errors.new_class('Update',  {capture_stack = false})
 
@@ -15,7 +14,7 @@ local update = {}
 local UPDATE_FUNC_NAME = '__update'
 
 local function call_update_on_storage(space_name, key, operations)
-    checks('string', '?', 'update_operations')
+    dev_checks('string', '?', 'table')
 
     local space = box.space[space_name]
     if space == nil then
@@ -44,7 +43,7 @@ end
 --
 -- @param table user_operations
 --  Operations to be performed.
---  See `spaceect:update` operations in Tarantool doc
+--  See `space:update` operations in Tarantool doc
 --
 -- @tparam ?number opts.timeout
 --  Function call timeout
@@ -54,7 +53,7 @@ end
 -- @treturn[2] table Error description
 --
 function update.call(space_name, key, user_operations, opts)
-    checks('string', '?', 'update_operations', {
+    checks('string', '?', 'table', {
         timeout = '?number',
     })
 
diff --git a/crud/upsert.lua b/crud/upsert.lua
index bddaf663..93e45dcc 100644
--- a/crud/upsert.lua
+++ b/crud/upsert.lua
@@ -5,8 +5,7 @@ local vshard = require('vshard')
 local call = require('crud.common.call')
 local registry = require('crud.common.registry')
 local utils = require('crud.common.utils')
-
-require('crud.common.checkers')
+local dev_checks = require('crud.common.dev_checks')
 
 local UpsertError = errors.new_class('UpsertError',  { capture_stack = false})
 
@@ -15,7 +14,7 @@ local upsert = {}
 local UPSERT_FUNC_NAME = '__upsert'
 
 local function call_upsert_on_storage(space_name, tuple, operations)
-    checks('string', 'table', 'update_operations')
+    dev_checks('string', 'table', 'table')
 
     local space = box.space[space_name]
     if space == nil then
@@ -43,7 +42,7 @@ end
 --
 -- @param table user_operations
 --  user_operations to be performed.
---  See `space_object:update` operations in Tarantool doc
+--  See `space:update` operations in Tarantool doc
 --
 -- @tparam ?number opts.timeout
 --  Function call timeout
@@ -53,7 +52,7 @@ end
 -- @treturn[2] table Error description
 --
 function upsert.call(space_name, obj, user_operations, opts)
-    checks('string', '?', 'update_operations', {
+    checks('string', '?', 'table', {
         timeout = '?number',
     })
 
diff --git a/test/helper.lua b/test/helper.lua
index ee436dfe..62d2c8ed 100644
--- a/test/helper.lua
+++ b/test/helper.lua
@@ -3,8 +3,12 @@ require('strict').on()
 local log = require('log')
 local checks = require('checks')
 local digest = require('digest')
-
 local fio = require('fio')
+
+if os.getenv('DEV') == nil then
+    os.setenv('DEV', 'ON')
+end
+
 local ok, cartridge_helpers = pcall(require, 'cartridge.test-helpers')
 if not ok then
     log.error('Please, install cartridge rock to run tests')
diff --git a/test/unit/select_executor_test.lua b/test/unit/select_executor_test.lua
index 9faef20d..122b50ae 100644
--- a/test/unit/select_executor_test.lua
+++ b/test/unit/select_executor_test.lua
@@ -108,7 +108,7 @@ g.test_one_condition_no_index = function()
     t.assert_equals(get_ids(results), {2, 3})
 
     -- after tuple 2
-    local after_tuple = space:frommap(customers[2])
+    local after_tuple = space:frommap(customers[2]):totable()
 
     local results = select_executor.execute(space, index, filter_func, {
         scan_value = plan.scan_value,
@@ -118,7 +118,7 @@ g.test_one_condition_no_index = function()
     t.assert_equals(get_ids(results), {3})
 
     -- after tuple 3
-    local after_tuple = space:frommap(customers[3])
+    local after_tuple = space:frommap(customers[3]):totable()
 
     local results = select_executor.execute(space, index, filter_func, {
         scan_value = plan.scan_value,
@@ -167,7 +167,7 @@ g.test_one_condition_with_index = function()
     t.assert_equals(get_ids(results), {3, 2, 4}) -- in age order
 
     -- after tuple 3
-    local after_tuple = space:frommap(customers[3])
+    local after_tuple = space:frommap(customers[3]):totable()
 
     local results = select_executor.execute(space, index, filter_func, {
         scan_value = plan.scan_value,
@@ -223,7 +223,7 @@ g.test_multiple_conditions = function()
     t.assert_equals(get_ids(results), {5, 2})  -- in age order
 
     -- after tuple 5
-    local after_tuple = space:frommap(customers[5])
+    local after_tuple = space:frommap(customers[5]):totable()
 
     local results = select_executor.execute(space, index, filter_func, {
         scan_value = plan.scan_value,
@@ -274,7 +274,7 @@ g.test_composite_index = function()
     t.assert_equals(get_ids(results), {2, 1, 4}) -- in full_name order
 
     -- after tuple 2
-    local after_tuple = space:frommap(customers[2])
+    local after_tuple = space:frommap(customers[2]):totable()
 
     local results = select_executor.execute(space, index, filter_func, {
         scan_value = plan.scan_value,