The benchmark is LOS with gapps indeed but on a better phone. The difference is drastic. I am aware that first connection with satellites can take longer, so i will keep testing to see how it goes.Yes, GPS fix is slow in some custom ROMs. What is your benchmark? Stock ROM or lineageOS with GApps? In microG there is a network location module to guess a location from WiFi or cell towers, as long as there is no GPS fix.
What do you mean with GPS fix? I see in microg core services that GPS is part of it