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A quick chime-in -- I doubt buffer bloat is having that significant of an effect.  Keep digging. There must be a major bottleneck somewhere. 

You didn't inadvertently set up a 100Mbps interface speed by accident?  Running over WiFi?

Check against multiple speed tests, or even use iperf3 from the CLI right on the firewall.

I recently had a major speed issue when using wireguard, turns out that I didn't have my hardware accel. features enabled in System->Settings->Misc.

A case of asymmetric routing, possibly?

Brilliant!  Thanks a million.  I've been fighting this problem for months.  No issue when remote, but internally, my sessions expire quickly.  Low and behold my system has multiple interfaces, and only one of which listens for ssh.  Looks like its time to do some more network tweaking!