diff --git a/Sources/SendKeysLib/Commands/Command.swift b/Sources/SendKeysLib/Commands/Command.swift
index 7db2fb1..ac0a252 100644
--- a/Sources/SendKeysLib/Commands/Command.swift
+++ b/Sources/SendKeysLib/Commands/Command.swift
@@ -23,6 +23,14 @@ public protocol CommandProtocol {
     func equals(_ comparison: Command) -> Bool
 }
 
+protocol RequiresKeyPresser {
+    var keyPresser: KeyPresser? { get set }
+}
+
+protocol RequiresMouseController {
+    var mouseController: MouseController? { get set }
+}
+
 public class Command: Equatable, CustomStringConvertible {
     public class var commandType: CommandType { return .undefined }
     
diff --git a/Sources/SendKeysLib/Commands/CommandFactory.swift b/Sources/SendKeysLib/Commands/CommandFactory.swift
index 321bb3e..b6cb800 100644
--- a/Sources/SendKeysLib/Commands/CommandFactory.swift
+++ b/Sources/SendKeysLib/Commands/CommandFactory.swift
@@ -14,7 +14,29 @@ public class CommandFactory {
         DefaultCommand.self
     ]
 
-    public static func create(_ commandType: Command.Type, arguments: [String?]) -> Command {
-        return commandType.init(arguments: arguments)
+    let keyPresser: KeyPresser
+    let mouseController: MouseController
+
+    init(keyPresser: KeyPresser, mouseController: MouseController) {
+        self.keyPresser = keyPresser
+        self.mouseController = mouseController
+    }
+    
+    convenience public init() {
+        self.init(keyPresser: KeyPresser(), mouseController: MouseController(animationRefreshInterval: 0.01))
+    }
+
+    public func create(_ commandType: Command.Type, arguments: [String?]) -> Command {
+        let command = commandType.init(arguments: arguments)
+        
+        if var keyCommand = command as? RequiresKeyPresser {
+            keyCommand.keyPresser = keyPresser
+        }
+        
+        if var mouseCommand = command as? RequiresMouseController {
+            mouseCommand.mouseController = mouseController
+        }
+
+        return command
     }
 }
diff --git a/Sources/SendKeysLib/Commands/CommandsIterator.swift b/Sources/SendKeysLib/Commands/CommandsIterator.swift
index 6c5f0d2..7b5e6b2 100644
--- a/Sources/SendKeysLib/Commands/CommandsIterator.swift
+++ b/Sources/SendKeysLib/Commands/CommandsIterator.swift
@@ -4,10 +4,13 @@ public class CommandsIterator: IteratorProtocol {
     public typealias Element = Command
 
     let commandString: String
+    let commandFactory: CommandFactory
+    
     var index = 0;
 
-    public init(_ commandString: String) {
+    public init(_ commandString: String, commandFactory: CommandFactory = CommandFactory()) {
         self.commandString = commandString
+        self.commandFactory = commandFactory
     }
 
     public func next() -> Element? {
@@ -20,7 +23,7 @@ public class CommandsIterator: IteratorProtocol {
                 }
             ) {
                 let args = getArguments(commandString, matchResult!)
-                let command = CommandFactory.create(commandType, arguments: args)
+                let command = commandFactory.create(commandType, arguments: args)
 
                 if matchResult != nil {
                     let range = Range(matchResult!.range, in: commandString)
diff --git a/Sources/SendKeysLib/Commands/CommandsProcessor.swift b/Sources/SendKeysLib/Commands/CommandsProcessor.swift
index e85ee32..9125851 100644
--- a/Sources/SendKeysLib/Commands/CommandsProcessor.swift
+++ b/Sources/SendKeysLib/Commands/CommandsProcessor.swift
@@ -5,22 +5,31 @@ public class CommandsProcessor {
     
     let numberFormatter = NumberFormatter()
     let commandExecutor: CommandExecutorProtocol
+    let keyPresser: KeyPresser
+    let mouseController: MouseController
     
-    public init(defaultPause: Double, commandExecutor: CommandExecutorProtocol? = nil) {
+    init(defaultPause: Double, keyPresser: KeyPresser, mouseController: MouseController, commandExecutor: CommandExecutorProtocol? = nil) {
         self.defaultPause = defaultPause
         self.commandExecutor = commandExecutor ?? CommandExecutor()
+        self.keyPresser = keyPresser
+        self.mouseController = mouseController
         
         numberFormatter.usesSignificantDigits = true
         numberFormatter.minimumSignificantDigits = 1
         numberFormatter.maximumSignificantDigits = 3
     }
+
+    convenience public init(defaultPause: Double, commandExecutor: CommandExecutorProtocol? = nil) {
+        self.init(defaultPause: defaultPause, keyPresser: KeyPresser(), mouseController: MouseController(animationRefreshInterval: 0.01), commandExecutor: commandExecutor)
+    }
         
     private func getDefaultPauseCommand() -> Command {
         return PauseCommand(duration: defaultPause)
     }
     
     public func process(_ commandString: String) {
-        let commands = IteratorSequence(CommandsIterator(commandString))
+        let commandFactory = CommandFactory(keyPresser: keyPresser, mouseController: mouseController)
+        let commands = IteratorSequence(CommandsIterator(commandString, commandFactory: commandFactory))
         var shouldDefaultPause = false
         var shouldIgnoreNextCommand = false
         
diff --git a/Sources/SendKeysLib/Commands/KeyDownCommand.swift b/Sources/SendKeysLib/Commands/KeyDownCommand.swift
index 0b34b87..62fdd18 100644
--- a/Sources/SendKeysLib/Commands/KeyDownCommand.swift
+++ b/Sources/SendKeysLib/Commands/KeyDownCommand.swift
@@ -15,6 +15,6 @@ public class KeyDownCommand: KeyPressCommand {
     }
 
     public override func execute() throws {
-        let _ = try! keyPresser.keyDown(key: key!, modifiers: modifiers)
+        let _ = try! keyPresser!.keyDown(key: key!, modifiers: modifiers)
     }
 }
diff --git a/Sources/SendKeysLib/Commands/KeyPressCommand.swift b/Sources/SendKeysLib/Commands/KeyPressCommand.swift
index 6fc99f0..bd54214 100644
--- a/Sources/SendKeysLib/Commands/KeyPressCommand.swift
+++ b/Sources/SendKeysLib/Commands/KeyPressCommand.swift
@@ -1,6 +1,6 @@
 import Foundation
 
-public class KeyPressCommand: Command {
+public class KeyPressCommand: Command, RequiresKeyPresser {
     public override class var commandType: CommandType { return .keyPress }
     
     private static let _expression = try! NSRegularExpression(pattern: "\\<[ck]:(.|[\\w]+)(:([,\\w⌘^⌥⇧]+))?\\>")
@@ -9,7 +9,7 @@ public class KeyPressCommand: Command {
     var key: String?
     var modifiers: [String] = []
     
-    let keyPresser = KeyPresser()
+    var keyPresser: KeyPresser?
     
     override init() {
         super.init()
@@ -30,7 +30,7 @@ public class KeyPressCommand: Command {
     }
 
     public override func execute() throws {
-        try! keyPresser.keyPress(key: key!, modifiers: modifiers)
+        try! keyPresser!.keyPress(key: key!, modifiers: modifiers)
     }
     
     public override func equals(_ comparison: Command) -> Bool {
diff --git a/Sources/SendKeysLib/Commands/KeyUpCommand.swift b/Sources/SendKeysLib/Commands/KeyUpCommand.swift
index c3bfc0d..2d3734b 100644
--- a/Sources/SendKeysLib/Commands/KeyUpCommand.swift
+++ b/Sources/SendKeysLib/Commands/KeyUpCommand.swift
@@ -15,6 +15,6 @@ public class KeyUpCommand: KeyPressCommand {
     }
 
     public override func execute() throws {
-        let _ = try! keyPresser.keyUp(key: key!, modifiers: modifiers)
+        let _ = try! keyPresser!.keyUp(key: key!, modifiers: modifiers)
     }
 }
diff --git a/Sources/SendKeysLib/Commands/MouseClickCommand.swift b/Sources/SendKeysLib/Commands/MouseClickCommand.swift
index 1a6b5e3..df1053d 100644
--- a/Sources/SendKeysLib/Commands/MouseClickCommand.swift
+++ b/Sources/SendKeysLib/Commands/MouseClickCommand.swift
@@ -1,6 +1,6 @@
 import Foundation
 
-public class MouseClickCommand: Command {
+public class MouseClickCommand: Command, RequiresMouseController {
     public override class var commandType: CommandType { return .mouseClick }
 
     private static let _expression = try! NSRegularExpression(pattern: "\\<m:([a-z]+)(:([a-z,]+))?(:(\\d+))?\\>")
@@ -10,7 +10,7 @@ public class MouseClickCommand: Command {
     var modifiers: [String] = []
     var clicks: Int = 1
 
-    let mouseController = MouseController()
+    var mouseController: MouseController?
 
     override init() {
         super.init()
@@ -33,7 +33,7 @@ public class MouseClickCommand: Command {
     }
 
     public override func execute() throws {
-        try! mouseController.click(
+        try! mouseController!.click(
             nil,
             button: getMouseButton(button: button!),
             flags: try! KeyPresser.getModifierFlags(modifiers),
diff --git a/Sources/SendKeysLib/Commands/MouseDragCommand.swift b/Sources/SendKeysLib/Commands/MouseDragCommand.swift
index dac9d02..7b2173c 100644
--- a/Sources/SendKeysLib/Commands/MouseDragCommand.swift
+++ b/Sources/SendKeysLib/Commands/MouseDragCommand.swift
@@ -34,7 +34,7 @@ public class MouseDragCommand: MouseMoveCommand {
     }
 
     public override func execute() throws {
-        try! mouseController.drag(
+        try! mouseController!.drag(
             start: x1 == nil || y1 == nil ? nil : CGPoint(x: x1!, y: y1!),
             end: CGPoint(x: x2, y: y2),
             duration: duration,
diff --git a/Sources/SendKeysLib/Commands/MouseMoveCommand.swift b/Sources/SendKeysLib/Commands/MouseMoveCommand.swift
index aa97355..db4e700 100644
--- a/Sources/SendKeysLib/Commands/MouseMoveCommand.swift
+++ b/Sources/SendKeysLib/Commands/MouseMoveCommand.swift
@@ -38,7 +38,7 @@ public class MouseMoveCommand: MouseClickCommand {
     }
 
     public override func execute() throws {
-        mouseController.move(
+        mouseController!.move(
             start: x1 == nil || y1 == nil ? nil : CGPoint(x: x1!, y: y1!),
             end: CGPoint(x: x2, y: y2),
             duration: duration,
diff --git a/Sources/SendKeysLib/Commands/MouseScrollCommand.swift b/Sources/SendKeysLib/Commands/MouseScrollCommand.swift
index 3bf5e30..5fa9551 100644
--- a/Sources/SendKeysLib/Commands/MouseScrollCommand.swift
+++ b/Sources/SendKeysLib/Commands/MouseScrollCommand.swift
@@ -29,7 +29,7 @@ public class MouseScrollCommand: MouseClickCommand {
     }
 
     public override func execute() throws {
-        mouseController.scroll(
+        mouseController!.scroll(
             CGPoint(x: x, y: y),
             duration,
             flags: try! KeyPresser.getModifierFlags(modifiers)
diff --git a/Sources/SendKeysLib/MouseController.swift b/Sources/SendKeysLib/MouseController.swift
index d0eacc8..614de71 100644
--- a/Sources/SendKeysLib/MouseController.swift
+++ b/Sources/SendKeysLib/MouseController.swift
@@ -6,9 +6,13 @@ class MouseController {
         case vertical
     }
     
-    let animationRefreshInterval: TimeInterval = 0.01
+    let animationRefreshInterval: TimeInterval
     let keyPresser = KeyPresser()
     
+    init(animationRefreshInterval: TimeInterval) {
+        self.animationRefreshInterval = animationRefreshInterval
+    }
+    
     func move(start: CGPoint?, end: CGPoint, duration: TimeInterval, flags: CGEventFlags) {
         let resolvedStart = start ?? getLocation()!
         let eventSource = CGEventSource(event: nil)
diff --git a/Sources/SendKeysLib/MousePosition.swift b/Sources/SendKeysLib/MousePosition.swift
index 34fda42..7d79c55 100644
--- a/Sources/SendKeysLib/MousePosition.swift
+++ b/Sources/SendKeysLib/MousePosition.swift
@@ -31,7 +31,7 @@ class MousePosition: ParsableCommand {
     }
 
     func printMousePosition() {
-        let location = MouseController().getLocation()!
+        let location = MouseController(animationRefreshInterval: 0.01).getLocation()!
         print(String(format: "%.0f,%.0f", location.x, location.y))
     }
 
diff --git a/Sources/SendKeysLib/Sender.swift b/Sources/SendKeysLib/Sender.swift
index 7babe71..3162153 100644
--- a/Sources/SendKeysLib/Sender.swift
+++ b/Sources/SendKeysLib/Sender.swift
@@ -23,6 +23,9 @@ public struct Sender: ParsableCommand {
     @Option(name: .shortAndLong, help: "String of characters to send.")
     var characters: String?
 
+    @Option(help: "Number of seconds between animation updates.")
+    var animationInterval: Double = 0.01
+
     public init() { }
 
     public mutating func run() throws {
@@ -32,7 +35,9 @@ public struct Sender: ParsableCommand {
             fputs("WARNING: Accessibility preferences must be enabled to use this tool. If running from the terminal, make sure that your terminal app has accessibility permissiions enabled.\n\n", stderr)
         }
 
-        let commandProcessor = CommandsProcessor(defaultPause: delay)
+        let keyPresser = KeyPresser()
+        let mouseController = MouseController(animationRefreshInterval: animationInterval)
+        let commandProcessor = CommandsProcessor(defaultPause: delay, keyPresser: keyPresser, mouseController: mouseController)
         var commandString: String?
 
         if !(inputFile ?? "").isEmpty {