Poor performance but only on the scroll thumb #1072
Description
Describe the bug
The scroll thumb consistently has incredibly bad performance on large, dynamic lists. This is pretty pervasive in my platform which uses tanstack/virtual quite a lot. More pronounced in development but still quite noticeable in production. sort of seems disconnected from real life render performance too?
Your minimal, reproducible example
Hard to repro without pretty large real life example
Steps to reproduce
use tanstack/virtual with a large list of complex items
Expected behavior
I expect the thumb to perform natively. I wonder if the scroll event is getting blocked somehow?
How often does this bug happen?
Often
Screenshots or Videos
No response
Platform
Kapture.2025-10-27.at.23.25.09.mp4
tanstack-virtual version
3.13.12
TypeScript version
No response
Additional context
No response
Terms & Code of Conduct
- I agree to follow this project's Code of Conduct
- I understand that if my bug cannot be reliable reproduced in a debuggable environment, it will probably not be fixed and this issue may even be closed.