By the end of this page, you'll know how to tell whether Ultimate Cursor is actually the source of a slowdown, and what to adjust if it is.
Applies to Ultimate Cursor 2.3.1+.
Confirm scripts are deferred
Open your browser's Network tab and confirm the Ultimate Cursor script loads with defer and doesn't block the page's initial render. See Performance & Asset Loading for exactly when and how scripts load.
Duplicate enqueues
The plugin guards against loading its script twice per page, so duplicate-enqueue issues are typically caused by a caching plugin serving a stale combined-JS bundle rather than the plugin itself. Clear your cache first.
Effect-heavy configurations
Some effects are more GPU/CPU-intensive than others — Antigravity Background with a high particleCount (default 300) is the most likely place to notice lag on lower-end devices. Reduce the count or particle size, or turn on the Pro quality setting on Light Pillar if you're targeting devices with limited GPU.