Asset textures often need to be resized or the compression method changed. Large Sized Textures cause issues for your players such as the map not loading making them fall through the map or other models not loading either. FXServer will warn you in the console if your YTD files are too large.
If you have issues compressing textures, feel free to comment and I’ll try to get back to you.
Best way to keep the quality of the file, you are going to resize is to keep the image in a DDS format (DirectDraw Surface) DDS is a compressed format and thus cannot be opened the same way a PNG or JPEG can.