We are aware of the performance issue with ABP on YouTube and other sites and we are preparing a fix we hope to release soon. Please keep an eye out for an update and let me know if you continue to see an issue. The current version of ABP is 3.22.
In the meantime, to help with the lag, unsubscribing from any unnecessary filter lists may help. We recommend only using only EasyList and ABP Filters, if possible.
I hope this helps! Please feel free to reply back if you have questions or if there is anything else I can do for you.
