Re: I moved the sims 4 and my mods to d-drive and my game takes forever to load.

@BunnyBee29  Loading from an external drive is generally slower, and often much slower, than loading from an internal one.  The data transfer speeds just don't compare to what you get with an internal connection.  So if you have any space at all, at least move your user folder (with the mods) to the internal drive, and move the game back if you have the room.  As long as you have at least 20 GB free on C after moving everything, you have enough space not to worry about it.

The red dots issue sounds like it's probably caused by a bad mod.