What actually accelerated this into a "serious-ish" issue, is the GSX Level 2 walk in gates. The passengers eat quite a lot of VRAM, and when compared to standard GSX L2 in jetways or buses, the passengers can be displayed in their entirety (when using jetways and buses, it will spread the passengers into much smaller area, and therefore the full number of passengers will never be displayed). So... to sum it up, it becomes an issue when you are trying to deboard 174 passengers to the terminal.
And also, it's very possible that not many people is using Brno and GSX Level 2 (with configured walk-in gates), so I might be the first person to report this.
But, again, just to stress this out, when I have compared the VRAM consumption of other sceneries, then there is a big difference between Brno and other sceneries of airports with roughly the same size, but even several major airports, which I have tested, have consumed less VRAM than Brno. For example, Fly Tampa Amsterdam v2.
So, this becomes an issue in this particular case.