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Gnome becomes unusable after suspending. Logging out fixes the problem. CPU and RAM usage looks normal.
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You wanted to look at your dmesg and journal, notice the used display server & hardware specs and elaborate on "gnome lag" since I doubt you're running any process by the name "gnome"...
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Nvidia binary driver? If so, that's your culprit and don't waste time trying to fix it... it's impossible and Nvidia doesn't care.
Please vote for all the AUR packages you're using. You can mass-vote for all of them by doing: "pacman -Qqm | xargs aurvote -v" (make sure to run "aurvote --configure" first)
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