If you are experiencing poor performance with 20 ms response time , I would not start playing with the TCP window size, 20 ms response is excellent response time , I would have the application and server support start looking a little harder at there piece os the pie, this sounds like a classic exapmle of the application /server guys not knowing how to fix there problem and blaming the network .
To further support your case you can sniff the wire to determine what is causing the poor performance .
20ms isn't bad for a WAN but with a default maximum TCP window size of 64KB, you're limited to ~24mbits/sec per flow if my calculations are correct. I'm not aware of a device that can adjust TCP window values in existing TCP sessions -- offhand, the practicality of such a device seems questionable at best.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...