My game loading slowly

[Alfred96]

Whenever the host starts the game, or I do, I always load the last one, or either the slowest. When the game starts everyone say that I lag, the game at first is slow, but after sometime it becomes fast, I always thought it was from the server that it gets adapted to the connection/system of every player? But before that "sometime" pass, someone quits and then I get kicked even though my Internet is decent, and my ping is no more than 150 ms. I play on my HP laptop a 6 GB RAM, i5 2.2 GHZ, and a 2 GB x2 NVIDIA GEFORCE video card. Windows 8.1 Professional, 64-bits OS.  The game can pretty much work on any PC doesn't matter. So.. That being said, what do I do now? What are the best solutions? Thanks.