Very customizable, though I haven't found my perfect settings yet. Trying to get rid of lag completely without making scrolling an uncontrollable mess. Maybe expert users can post their preferred settings, so new users can try them out and see what works for them.

For those who can't find the YASS configuration settings, you have to go to the list of Firefox extensions (about:addons) and click the "..." button next to Yet Another Smooth Scrolling WE. From the context menu, select "Options".

That seems to be the only way to get there, as the configuration screen is not available from YASS's Manage Extension page. Maybe the creator of the extension can fix this?