Hi Aleksey,

use SYS(1104) kill VFP performance ( on WAN it put VFP not direct usable )
for every Table ( also for static table ).

I suggest to VFPT to implement this ( meta language ):

IF NOT REQUEST_DATA_IN_CACHE OR FTIME(FILE_DATA)>LAST_REFRESH
    LAST_REFRESH = FTIME(FILE_DATA) 
&& before for worse case without write lock
    REFRESH_FILE_DATA_IN_CACHE
ENDIF
RETURN_REQUEST_DATA

and add a CURSORPROPERTY for enable/disable it.

If FILE_DATA ( not cursor ) is Read_Only ( static file )
VFP can put CURSORPROPERTY to fixed disabled.

I think FTIME(FILE_DATA) is fast, also on network LAN/WAN,
and data used is correct.