Quick View is too slow

[m^2]

By "original" you mean "w/out plugins", right?

If so, associate (Config->Misc) Ctrl+Q with cm_SrcQuickInternalOnly.

I already have

Code:

CS+Q=cm_SrcQuickInternalOnly

in wincmd.ini. This is hotkey assigning, right?

Yes, it is assigning cm_SrcQuickInternalOnly to Ctrl+Shift+Q.
You can either change it to

Code:

C+Q=cm_SrcQuickInternalOnly

or just use Ctrl+Shift+Q.