Probably not. I would guess that it's more likely to be hard disk related, or due to the game you are playing. It could also be due to the power mode settings you are using, try switching to max power in both windows and the laptops keys for power mode.
It's also worth noting that the specs for the x54c I found via googling didn't look all that impressive for a gaming machine, it could simply be that you are expecting too much of it. If you post your specs, or your full model number, along with what games you are playing, people can tell you if or not that is the case.
If you are convinced it is heat related, get an application to monitor your CPU and GPU temps and clock speeds over time, if you see high temperatures or the clock speeds slowing down, then you may suspect a dust issue.
If you do think it's dust related, don't disassemble the laptop as this will void your warranty on a very young laptop. I typically clean for dust by blowing compressed air into the laptops exhaust and intake ports, I've never checked how other people do it so there may be better methods, but that should get rid of any minor dust buildup.