From a mapper's perspective, the bigger your map gets, the more problems you'll get with optimization. I'm currently making a map that'll have a playable field of around 16440x12485 on the grid (or 313,07 metres x 235,37 metres) For your reference, De_dust2 is around 2500x1500 in grid size.

I don't know how big Dog red or bastogne is, but I have a feeling this map will be bigger than any of those. People are already complaining about video lag and frame drops, and the bigger and more open your map becomes, the harder it becomes to optimize because people see so much of the map at any given time. Something you don't have with closed down maps as in CSGO

It's not impossible to optimize a large open map, but you'll have to comprimise in some ways and lower end computers in the end will still suffer from it.