Sequoia on Late 13 MBP

Hi! My specs is: 16 gb 1600 MHz DDR3 Intel Iris 1536MB 2.8 GHz Dual Core I7

So i have some problems. From what I've read from people who have the same device as mine, Sequoia doesn't cause any problems. There are even people who say it works great even on 2009 MacBook models. But the situation is not very good for me. There are problems such as overheating and slowing down. Do things like Thermal Paste and cleaning make a big difference? Or can you help me on this issue? THX