OBS skippin' & missin' frames when I'm in a Discord call

Hi! I'm getting frames missed due to rendering lag, and frames skipped due to encoding lag, but this only happens when I'm in a Discord voice call* at the same time. Oh yeah, it also made my game hiccup now and then. Any suggestions?

I'm already following everything in the guide -- https://obsproject.com/kb/encoding-performance-troubleshooting

*The Discord voice call also has me sharing my screen with those in the call, but I turned it as low as it can go, 480p 15fps