What is the largest Invoke Code activity you have ever made? Is there a limit to how many lines of code you can slip into this activity before it starts breaking Studio?
Thanks
Hi @edevries
To answer your question, you can technically paste hundreds or even thousands of lines into an Invoke Code block, there is no strict limit. However, once you get into the few-hundred-lines range (~300–500+), you may start seeing:
- Slower Studio performance (lag when opening/editing)
- Harder debugging (no proper breakpoints inside Invoke Code)
- Increased risk of compilation quirks or vague errors
- Beyond that (especially 1000+ lines), it becomes unmanageable rather than “broken.”
So the issue isn’t a strict system limit — it’s maintainability and stability.
Instead of growing a massive Invoke Code:
- Break logic into smaller workflows → Use
Invoke Workflow Fileinstead - Use libraries → Create reusable components in UiPath Libraries
- Move heavy logic to compiled code → Use a C# or VB.NET class library and reference it
- Keep Invoke Code for:
- Small, focused logic
- Quick transformations
- Edge cases not easily handled by activities
The largest one I ever made had 150 lines of code. But I soon optimized it have 3 separate “Invoke Code” activities that achieved the same goal.
Hope this helps. Happy coding 
I appreciate the input. Stability, however, is not a part of the solution I have planned.
Its a strange question to me, but as I say often. Don’t use Invoke Code anymore, there are coded workflows and coded source files.
You can build everything you need in classes and call the function, or use a coded workflow and call it as a workflow. Invoke Code is really not needed.
I have stuff with tens of thousands of lines using coded source files.
Agreed @Jon_Smith
So what exactly do you have planned? @edevries
Nothing stable apparently 
were you able to test this out and max out the number of lines