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> 1. Firefox and Chrome are very slow and freezing, when opening many tabs.

> 2. Flash plugin is crashing constantly

Try that without the flash plugin.

> 3. OpenOffice is very slow and freezing. Can't render properly MS Office documents.

I find it more likely that Office can't save its files according to whatever is the current Office file spec.

That may be the case, but I bet Office can handle those documents just fine. The non-techy user doesn't care why something doesn't work. They just care that it doesn't work.

1,2. Try using chromium and ff4 (minefield for 64 bits) 3. These are known OO problems, version 3.2 is a lot better.

I recommend the nightly chromium dev build if you can do it.