How do LCS PC keep the game at 240fps all game ?

Hi, I saw in LCS that they use Alienware 240hz monitors, so I assume they run the game at 240 FPS ? How do they keep the game above 240 FPS all game. At the start of the game I start at around 400, but it drops as slow as 160-170 after a 40 minutes game. How do LCS PCs not have this issue ? My specs: i7-8700k, 1080ti, 32gb RAM & game run on a NVME SSD, same on my laptop with i7-8750h, RTX 2080 max Q, 16gb & game also on the NVME SSD, so it's not the PC that s causing issues. Anyone can help me out ?
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