vim is very slow when opening multiple , large , gzip files

I know it might be normal, how can I expect it to be same fast as small/single txt file?

but the thing is `less` is much faster, in the same situation...

so this is how I opened them:

vim *.gz

and I got all these gz files opened. each of the gz files is about 4M Bytes. so far nice and the vim magic works (display gzip file directly) great.

then I :bn to move the next buffer, it took long time...

it seems those files displayed as buffers were actually not "opened" unless I ever move to them each at least once.

OK, assuming after I moved to a file it is now really opened, but then after that even switching between 2 already "opened" buffers that I ever moved to , are still slow -- not as slow as the first time when I try to :bn to, but still need to wait around 6 or 7 seconds...

 

is there any way / knobs to make it faster in this situation?

thanks!

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