NFS has caching?

I have around 100 files, currently NFS shared among 5 servers, all
servers access the file quite frequently, e.g. 10 hits per second per
server.

I cannot afford to rync since i want the delay of write as small as
possible, e.g. less than 1 second.

I want to know, since the file will be accessed quite frequent, does
NFS has build-in caching functions that if files are not modified, it
will not try to fetch from the network?

Thanks.

.

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