Many Mac users reported that their computers have been running slower than usual on Thursday — including a number of Verge staffers — with apps launching slowly or not at all, alongside other Apple service issues.

It appears that the problem is due to many people rushing to download macOS Big Sur, which was officially released today, which in turn seems to have crashed Apple’s OCSP (online certificate status protocol) service — which is used for several key aspects of macOS, including validating digital certificates for both Apple and third-party software on the Mac, as Ars Technica reports.

Apple’s status site notes that the company had resolved an issue earlier today that may have prevented users from downloading macOS software updates, although it hasn’t been confirmed that the Big Sur update was the cause of the outage. The company also reported issues with iMessage and full-blown outages with Maps routing and navigation as well as its traffic tracking, which may have been related to the OSCP failure, too.

Mac and iOS developer Panic reports corroborates the reports, noting that the downed service had disabled Apple’s Gatekeeper technology, which checks validity of apps when you try to launch them. Panic also reports that the issue appears to be resolved, but it’s not clear if things have totally cleared up for everyone yet.

Apple didn’t immediately reply to a request for comment.