diff --git a/rsqueakvm/primitives/array_stream.py b/rsqueakvm/primitives/array_stream.py
index 807f8737..476682bd 100644
--- a/rsqueakvm/primitives/array_stream.py
+++ b/rsqueakvm/primitives/array_stream.py
@@ -56,4 +56,5 @@ def func(interp, s_frame, w_receiver, n0, w_value):
     if not (isinstance(w_receiver, W_BytesObject) or
             isinstance(w_receiver, W_WordsObject)):
         raise PrimitiveFailedError
-    return w_receiver.short_atput0(interp.space, n0, w_value)
+    w_receiver.short_atput0(interp.space, n0, w_value)
+    return w_value
diff --git a/rsqueakvm/primitives/control.py b/rsqueakvm/primitives/control.py
index c0310801..ca677d3b 100644
--- a/rsqueakvm/primitives/control.py
+++ b/rsqueakvm/primitives/control.py
@@ -255,14 +255,12 @@ def func(interp, s_frame, w_block_ctx, args_w):
 @expose_primitive(PERFORM,
                   no_result=True, clean_stack=False)
 def func(interp, s_frame, argcount):
-    if argcount == 1:
-        w_selector = s_frame.pop()
-        w_rcvr = s_frame.top()
-        return s_frame._sendSelector(
-            w_selector, 0, interp, w_rcvr,
-            w_rcvr.class_shadow(interp.space))
-    else:
-        raise PrimitiveFailedError
+    arguments_w = s_frame.pop_and_return_n(argcount - 1)
+    w_selector = s_frame.pop()
+    w_rcvr = s_frame.top()
+    return s_frame._sendSelector(
+        w_selector, argcount - 1, interp, w_rcvr,
+        w_rcvr.class_shadow(interp.space), w_arguments=arguments_w)
 
 @expose_primitive(PERFORM_WITH_ARGS,
                   unwrap_spec=[object, object, list],
diff --git a/rsqueakvm/primitives/system.py b/rsqueakvm/primitives/system.py
index 4c2a588e..266a48a2 100644
--- a/rsqueakvm/primitives/system.py
+++ b/rsqueakvm/primitives/system.py
@@ -1,3 +1,5 @@
+from rpython.rlib import jit
+
 from rsqueakvm import constants
 from rsqueakvm.error import PrimitiveFailedError, MetaPrimFailed
 from rsqueakvm.model.numeric import W_SmallInteger
@@ -40,7 +42,9 @@ def func(interp, s_frame, w_rcvr, primFailFlag):
     raise PrimitiveFailedError
 
 @expose_primitive(VM_PARAMETERS)
+@jit.dont_look_inside
 def func(interp, s_frame, argcount):
+    from rpython.rlib import jit_hooks
     """Behaviour depends on argument count:
             0 args: return an Array of VM parameter values;
             1 arg:  return the indicated VM parameter;
@@ -123,13 +127,20 @@ def func(interp, s_frame, argcount):
     vm_w_params[8] = interp.space.wrap_int(1)  # must be 1 for VM Stats view to work
 
     vm_w_params[41] = interp.space.wrap_int(1)  # We are a "stack-like" VM - number of stack tables
-    vm_w_params[45] = interp.space.wrap_int(1)  # We are a "cog-like" VM - machine code zone size
+    # sizeOfMachineCode = jit_hooks.stats_asmmemmgr_allocated(None)
+    sizeOfMachineCode = jit_hooks.stats_asmmemmgr_used(None)
+    vm_w_params[45] = interp.space.wrap_int(sizeOfMachineCode)
 
     vm_w_params[39] = interp.space.wrap_int(constants.BYTES_PER_WORD)
     vm_w_params[40] = interp.space.wrap_int(interp.image.version.magic)
     vm_w_params[55] = interp.space.wrap_int(interp.process_switch_count)
     vm_w_params[57] = interp.space.wrap_int(interp.forced_interrupt_checks_count)
     vm_w_params[59] = interp.space.wrap_int(interp.stack_overflow_count)
+
+    numberOfLoops = jit_hooks.stats_get_counter_value(None, jit.Counters.TOTAL_COMPILED_LOOPS)
+    numberOfBridges = jit_hooks.stats_get_counter_value(None, jit.Counters.TOTAL_COMPILED_BRIDGES)
+    vm_w_params[63] = interp.space.wrap_int(numberOfLoops + numberOfBridges)
+
     vm_w_params[69] = interp.space.wrap_int(constants.INTERP_PROXY_MAJOR)
     vm_w_params[70] = interp.space.wrap_int(constants.INTERP_PROXY_MINOR)
 
diff --git a/rsqueakvm/test/test_miniimage.py b/rsqueakvm/test/test_miniimage.py
index 43dc03cf..e3f8c799 100644
--- a/rsqueakvm/test/test_miniimage.py
+++ b/rsqueakvm/test/test_miniimage.py
@@ -301,9 +301,39 @@ def test_primitive_perform():
     for sel in selectors_w:
         if sel.unwrap_string(None) == 'size':
             w_sel = sel
+            break
     size = _prim(space, PERFORM, [w_o, w_sel])
     assert size.value == 3
 
+def test_primitive_perform_with():
+    from rsqueakvm.test.test_primitives import _prim
+    w_o = space.wrap_list([space.wrap_int(1), 2, 3])
+    w_methoddict = w_o.class_shadow(space).s_superclass().s_superclass().s_superclass().s_superclass().w_methoddict()
+    w_methoddict.as_methoddict_get_shadow(space).sync_method_cache()
+    selectors_w = w_methoddict.strategy.methoddict.keys()
+    w_sel = None
+    for sel in selectors_w:
+        if sel.unwrap_string(None) == 'at:':
+            w_sel = sel
+            break
+    index = _prim(space, PERFORM, [w_o, w_sel, space.wrap_int(1)])
+    assert index.value == 1
+
+def test_primitive_perform_with_with():
+    from rsqueakvm.test.test_primitives import _prim
+    w_o = space.wrap_list([1, 2, 3])
+    w_methoddict = w_o.class_shadow(space).s_superclass().s_superclass().s_superclass().s_superclass().w_methoddict()
+    w_methoddict.as_methoddict_get_shadow(space).sync_method_cache()
+    selectors_w = w_methoddict.strategy.methoddict.keys()
+    w_sel = None
+    for sel in selectors_w:
+        if sel.unwrap_string(None) == 'at:put:':
+            w_sel = sel
+            break
+    w_val = _prim(space, PERFORM, [w_o, w_sel, space.wrap_int(1), space.w_nil])
+    assert w_val is space.w_nil
+    assert w_o.fetch(space, 0) is space.w_nil
+
 def test_primitive_perform_with_args():
     from rsqueakvm.test.test_primitives import _prim
     w_o = space.wrap_list([1, 2, 3])