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How do you fix Roblox Studio Error Code 601 (Plugin Sandboxed Memory Exceeded)?
Fix Roblox Studio Error Code 601 memory crashes. Learn how to locate leaking third-party plugins, audit Luau script threads, and clear the studio plugin cache.
How do you fix Roblox Studio Error Code 601 (Plugin Sandboxed Memory Exceeded)? Roblox Error Code 601 occurs in Roblox Studio when an installed third-party plugin creates an infinite Luau execution loop or leaks heap memory past the sandbox quota. The Studio engine terminates the offending plugin thread to protect project files from corruption and is resolved by disabling unverified plugins via the Studio Plugins Manager.
| Telemetry Metric | Verified Value |
|---|---|
| Subsystem | Roblox Studio Plugin Sandboxed Execution Environment |
| Security Boundary | Isolated Luau VM memory quota per plugin process |
| Common Trigger | Unoptimized building tools, terrain generators, or malicious backdoor plugins |
| Plugin Directory | %localappdata%\Roblox\Plugins |
| Average Resolution Time | < 3 minutes |
Why Studio Plugins Crash with Error 601
Roblox Studio executes third-party plugins within a sandboxed Luau virtual machine with strict heap memory ceilings. If a plugin runs un-throttled while loops, repeatedly clones heavy models without garbage collection, or stores millions of DataStore keys in memory, the engine halts the process with: "Roblox Studio plugin sandboxed Lua thread exceeded maximum memory limit. (Error Code: 601)".
Step 1: Isolate the Leaking Plugin
1. In Roblox Studio, click the Plugins tab on the top ribbon.
2. Click Manage Plugins to open the plugin inventory window.
3. Toggle all third-party plugins OFF, then enable them one at a time while observing memory usage in View -> Script Performance.
4. Permanently uninstall any plugin that causes sudden spikes exceeding 500 MB RAM.
Step 2: Inspect Plugins for Malicious Scripts
Fake or copied versions of popular plugins (e.g. counterfeit Moon Animator or Archimedes tools) often contain obfuscated require() scripts that replicate malicious models into your workspace until memory limits are reached. Only install plugins created by verified community authors.
Step 3: Clear the Local Plugins Cache
To clean orphaned plugin scripts, close Roblox Studio, navigate to %localappdata%\Roblox\Plugins in Windows File Explorer, and delete outdated folder contents before relaunching.
Related Questions in this Topic Cluster
Roblox Error Code 146 is a Roblox Studio modeling failure triggered when a Constructive Solid Geometry (CSG) union operation exceeds the polygon budget or non-manifold topology limits. It occurs during Union, Negate, or Separate operations on complex parts and is resolved by enabling the CSG v3 engine or converting dense geometry into external 3D meshes.
To profile Luau memory leaks in Roblox Studio, press F9 or navigate to View -> Developer Console -> Memory, then inspect the LuaHeap and Signals allocations. Memory leaks occur primarily when RBXScriptConnections remain connected after parent instances are destroyed, and are permanently resolved by calling :Disconnect() or utilizing the Janitor/Trove lifecycle pattern.
Official Diagnostic Tools & Download Links
Verified first-party resources related to this topic: