Ping and download slow in Firefox/ not IE or Chrome

I've reinstalled, created new profile, tried safe mode, ran virus checks and malware checks, disabled Protected Mode in Flash. The first try after shutting off ProtedtedMode gave good results. But now it's back to twice the numbers I get from Chrome and IE. DSL provider had me ping from the command prompt, and all is OK. What else can I try, so I can stay with Firefox?

Which tests are you running (i.e., URL please)?
I assume these are pure Flash tests; do you have any comparison data from Flash 11.3 to know whether it's something new in Flash 11.4?
In Safe Mode, Firefox's native hardware graphics acceleration feature is disabled, but you also could disable it in normal mode as there occasionally are conflicts with display drivers which create performance problems.
You usually need to restart Firefox in order for this to take effect, so save all work first (e.g., mail you are composing, online documents you're editing, etc.).
orange Firefox button ''or'' classic Tools menu > Options > Advanced
On the "General" mini-tab, uncheck the box for "Use hardware acceleration when available"

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