NEWS!
I have officially ported the UOC Patch to Firefox 52 ESR based browsers. I had the chance to test the 45 ESR version on the official Firefox 52 ESR and regular Firefox 56, and I was pretty much disappointed by something that I thought would have been taken for granted: tiled compositing and asynchronous pan and zoom after 45 ESR has been broken by Mozilla, and never fixed!
So, I had no other choice than disable those two features, prompting me to release a 52 ESR-and-upwards specific version of the UOC Patch. So now, any browser that uses such a version as a codebase, can be optimized to run better. This new version uses the UOC Enforcer for 45 ESR based browsers, which now is known as the UOC Enforcer for 45 and 52 ESR based browsers.
But bear in mind this important thing:
You will need a 128 bit buss or even better, a 256 bit buss graphics card. I have done the porting of the UOC Patch for 52 ESR based browsers on a Pentium 4 Prescott system fitted with a 64 bit buss graphics card (ATI Radeon X300SE), and the performance increment was negligible at its best, due to the bottleneck caused by the graphics card. So if you want the fastest performance you can achieve with a Mozilla-based browser, I recommend you to go with Roytam1's Firefox 45 ESR SSE, since it has an actual working implementation of tiled compositing and asynchronous pan and zoom (which indeed is enabled by default in the 45 ESR version of the UOC Patch), unless you have a capable graphics card that can fully accelerate the browser even without the offending features.
The newer Firefox builds never cease to amaze me, unfortunately in a negative way.