Hey, thanks for the comprehensive answer! This has put me into a lot of thinking...

2- I logged into the two frontends by both methods (with and without Keychain) and they actually behave in a similar manner in that regards. I couldn't replicate the issue when logging without Keychain so I can confirm your conclusion - the problem sits around Keychain...

3- Traffic doesn't seem to be a bottleneck and your server is a top witness. All witnesses carry the same traffic load? While I could easily resolve both the lack of SSD and the dynamic IP address with a small investment, the latency seems to be the show-stopper for the moment, if that's critical. Unfortunately the best providers here offer wireless internet only, last year I asked around, no plans for any major upgrades, it's a low populated area, still. For instance, the best response time I get is above 30ms, the average is like 60-70ms and often it's even in the 3-digits range :( Upload/Download ratio is 1/5 but I guess that's not an issue.

What would be your advice, should I give it a try or wait until I get better connectivity?