increasing default read size? & using direct read?

I was noticing that it took a LONG time to read in a 606.9MB file in
a "local" gvim session (local meaning gvim running on same machine
as file is located).

I finally figured that it was reading 64KB at a time
using async reads.

That is really slow compared to using a direct
read of say, 16M at a time....

I.e. using the async reads, for a 8M file takes 2.14s.
It averages 4MB/s,

Using a direct read of 16M/read takes .18s averaging 3.5GB/s.

Is there anyway to speed up vim's reading of large files?


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