Imac is extremely hot and makes a lot of noise.

I have am iMac of mid 2010. But I've seeing that from a month ago it have slowed its performance, and when I open three or four desktops it starts heating a lot on the top, making a lot of noise, I guess coming from the fans. However, before you could put the palm of your hand and you could resist it, now its too hot. How I can I solve this issue? Thanks for your help!

Not getting into the OP's temp details for the moment (they are very hot, especially the drive), but as far as I know there are now no guaranteed adware free sites to download iStat Pro from. The Apple download site links to the long defunct iSlayer/Bjango. The OP may have installed adware from the iStat Pro download.
For free programs, the best is to offer Temperature Monitor, although it won't show fan speeds without getting the paid Hardware Monitor. (Just noticed TM is no longer being supported by Bresink. The download is still available and probably should work OK on all but the very latest machines.)
Hardware Monitor is still being supported. Latest version 4.98. But even there may not support latest Macs.

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