Client
Whole client is a bug.
There are a lot of problems with client that have nothing to do with the "strenght of pc" no matter how good your PC is, the problem is in client.I used to have bad pc and i thought that bugs were because of that but i bought new one 2 months ago and i run league with solid 150-200 fps but client bugs are still there.
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Rune pages dissapearing while im in lobby so im stuck with presets one that riot gave me (which are usseles), and you have to dodge and re-enter the client because thats the only way they can get back to normal again.THIS ONE IS DRIVING ME MAD, cause right now i restarted client 5 times and i still have only presets.
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Champion icons not visible in champion select and i cant choose champ so again i have to dodge in order for them to be visible again ( this one hasnt happened to me on new PC YET but i assume it will one day)
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Post game lobby sometimes freezes on "Game is still loading"and again i have to re-enter the client.
There are probably more bugs but these are the ones that i encounter from time to time and when they happen it really sucks.There are also a lot of people that have problem with client bugs and that client is bad which is true.
Client is in bad state since its release and since then nothing has been fixed or addressed.