1 second divided by 20 is 0.050s, which is 50ms.
"07.02 22:47:59 [Server] INFO Dim 0 : Mean tick time: 7.325 ms. Mean TPS: 20.00" means that the server is managing to compute a tick in 7.325ms, which is great.
When that time goes above 50ms, your tps rate starts to drop, because it's can't keep the minimum optimal rate of 20 ticks a second. With the previous host, just me on the map, I was seeing 46ms. On this one, 8ms with 3 players online with all their machines whirring around, I say it's a huge improvement