Display modules and "filled" display modules even more so do have a huge impact on framerates
{F10698}
the maximum number of modules that get rendering is 1200 (fixed game side) ...
doing that drops my FPS from around 300 down to 50-60 with some modules filled in randomly
{F10700}
the same wall rebuild with a copy paste filled module drops me to around 30 FPS
this is on an RX 470 AMD GPU
NV 970 has a similar result
there is probably a need for a adjustable setting to how many of them in sight actually render ... or further improvements in how they do render.