Client Bugs/Lags/Crashes computer with patch 6.3 installed

I've never had any issues with playing league over the year or so I've been playing it, However with the new patch 6.3 it has ... wrecked my pc. took 6 hours to update with a horrific volume of issues along the way, often freezing or crashing my computer in the process. finally resolved by uninstalling a reinstalling the client. Apon launching the game it appeared as if problem solved however shortly the game the client froze and ultimately crashed my PC yet again a few minutes later... not sure if this is an issue with the new game client or a co'incidence that the issues only arose when trying to update the game. Has anyone else had issues with the new update affecting the game Client / PC?
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