I love this addon but lately it causes 60 - 80 % cpu load on youtube videos with live chat (at least I believe thats what's causing it).

E.g. on this site https://www.youtube.com/watch?v=ZXXA3rov59A it is causing high cpu load, while on vids from LinusTech w/o the live chat it is not.

Testing it was easy. Just deactivating your addon on above mentioned site lowered my cpu load by 50 to 60 %.