This isn't about hashrate from graphic cards but the ping (ms) on pool using mining software, I used Trex miner for a long time now and after hearing about lol miner latest update performance I wanted to give a try but I found out that I get better ping on lolminer than Trex miner, 120ms (Trex) and 60ma (lolminer), why am I just knowing this now?.
First of all any ping below 200 ms is OK for mining in a stable way,of course you will have a few stale shares but most of the time you can do stable mining with such ping values.Personally I was suffering from the high ping as I had a 8 Megabit connection and I barely could use anydesk to troubleshoot my rigs when I had to,so I switched to 100 Megabit fiber connection and with Lolminer I got 19 ms but the same with T-rex when using LAN cable and I get about 39-40ms with wireless.So in the end most likely the problem is your internet connection.