Thanks for explanations!
Regarding CSMT - thanks for pointing that out! It was disabled, indeed. However now I can't resist to check how it works when enabled :) - I have 2 cores / 2 threads only, but as I understand there should be at least some performance improvement? I'll let you know after next gaming session.
Regarding WineHQ linking issue - thanks, so next time it would not stop me. Here is the updated report for Dungeon Rats:
Game: Dungeon Rats
Version: GOG 1.0.6
Installer MD5: 6d045b383927ba999b858f905d7decd0 setup_dungeon_rats_64_1.0.6.0028_(14031).exe
Distro: Linux Mint 18 Sarah MATE 64-bit
Kernel version: 4.4.0-98-generic x86_64
Graphics card: Intel HD Graphics
Wine version(s) tested: Wine 2.20-staging
WineHQ AppDB link: GOG 1.0.1 (closest, but not exactly the current and tested one)
Install notes: It is necessary to add the following libraries: d3dcompiler and devenum. Game is started with DR64.exe (64-bit installation has been selected).
Installation process ends with 3 pop-up "runtime error" messages at the end, but finally GOG installer shows "Installation succesfull". These problems occurs for various GOG games and has no further impact on gameplay.
How well does it run: Perfect. No full playthrough, but various levels and gameplay aspects checked with previously created savegames.
Details: I'm using budget laptop with Intel Pentium CPU 3550M 2x2.30GHz + integrated Intel HD Graphics on board. Performance is really good.
There are small graphical artifacts visible in part of locations (black squares between floor and walls in caves). It does not affect the gameplay and it's the only problem you should expect as a Linux/Wine user.