I updated Premiere yesterday and ever since then, my export times have at least doubled. I exported a video at 1080p60fps before I updated and then did it again after I noticed the slowdown, and it took at least twice as long. What would be the cause for this and is there anything I can do to fix it?
One of the great features of Premiere (and the crest of the adobe suite) is that you can keep multiple versions of the apps on your computer, so there's no reason not to revert to the previous version until there's a new update that hopefully fixes the problem. Updates often demand greater system resources. Did you check to make sure that your system still meets the minimum specs
You might also tell us your system specs: OS version, Premiere version, amount of RAM, Hardware specs including graphics card. And doublecheck that your renderer is still set appropriately in your project settings.