Revolution still slow

Hi.
After update on Revo 2.07, there may be a little acceleration, but backend still slow.
I have tested various Modx versions of the various webhosting(and localhosts), with different browsers and computers (from Pentium 4 notebooks, up to quad-core desktop). Definitely the speed and backend administration requirements is a first and huge problem. I can say that the administration is a great torture on older computers (such pentiom 4 for example). Run two separate browsers with ModX backend (not to mention 3 or more), and work in them is almost impossible. Is the problem in ExtJS or its implementation, I do not know, but what I found, and many other administrations is too slow.
thx.

If you’re posting about a bug, please state all of your Environment information in your post: Version of MODx, Traditional or Advanced distribution (for Revo), Server OS, Server Version, PHP Version, MySQL Version (client and server), is pdo_mysql installed, your Browser type and version, if you are using any opcode caching such as eAccelerator, APC, winCache, xCache, etc; any relevant errors in core/cache/logs/error.log, and any other environment data we should know. We can’t help you without that information.