I did a quick search on that model Lenovo, I did not find any review or information that suggested it has good game performance. Apparently it was a low budget general purpose laptop. Integrated graphics generally use system ram for vram, which means if you have 4gb system ram and your R5 uses 2gb then you really only have 2gb of system ram for your games. Adding more ram may help in that situation. Let me be clear though, your framerate will be the same. Adding ram will help smooth out any stutters in the game when memory runs low and the computer must use the pagefile(aka swapfile).
So, for example, if you were getting 30fps in the game with some stuttering in the game, after adding more ram you'll still be getting 30fps but now it...