Lag/Performance Problems With Firefox
Whenever I watch anything requiring Adobe Flash (a YouTube vid, an anime episode on Crunchyroll, the latest episode of a show on RoosterTeeth's website, etc) on my Firefox (Version 22), it's horribly laggy and slow, with the picture AND sound lagging and 'skipping', and occasionally for YouTube the image will 'pixellate' and/or the sound quality will nosedive. According to the right-click option, my Firefox uses Flash 11.8. However, watching a vid on my Internet Explorer 7, which uses Flash 10.0, produces no such problems; the picture and sound are excellent. This problem has persisted ever since shortly after I first installed and began using Firefox earlier this year, when I (apparently mistakenly) accepted the offer to update my Firefox's Adobe Flash to Version 11 (it kept giving me "your Flash is outdated" messages that I had to click away to watch a vid, and that annoyed me so I wanted to make it stop).
This problem has been plaguing me for several months, and now that RoosterTeeth no longer supports IE7, I am unable to properly watch their new episodes. I have tried nearly everything - disabling Hardware Acceleration (with Firefox AND with Adobe Flash), having other tabs closed, several Flash updates as they become available since this problem's inception, upgrading my graphics driver, desperate prayer to God (and I'm a fairly secular man), EVERYTHING.
Could someone please tell me what is causing this months-running problem and how I could possibly hope to fix it?