Inconsistent performance for browser-based apps on nixOS setups?

Hi folks,
I’m seeing inconsistent performance when running lightweight, browser-based apps on nixOS, especially after system updates or profile switches. Sometimes things feel snappy, other times there’s noticeable input lag or delayed asset loading. I’m wondering if this is tied to browser sandboxing, GPU acceleration settings, or how dependencies are pinned across profiles.

I noticed a similar discussion elsewhere while testing a small web app and followed a reference to learn more, which made me curious about whether nixos-specific configs can impact client-side performance this much.

Has anyone run into this? Do you usually look at browser flags, mesa versions, or nixos module options first when troubleshooting?