Call of duty matching mechanism is very sand sculpture, as long as your network is too poor to reach the quality of foreigners' network, you can't match it, unlike the battlefield where you can directly search the server to enter the room. You can only turn on the accelerator after Call of Duty Black ops III, otherwise you can't play. Most accelerators should have ps4 games now. There are tutorials after the acceleration. You can set the network guarantee of ps4 manually according to the tutorial just like a computer.