After Gtk WebKit1 port was removed, an entry wasn't removed from WebKitBuildbot.js. Turns out that this somehow makes the dashboard request tester status as fast as it can, multiple times a second. The obsolete entry was "GTK Linux 64-bit Release WK1 (Tests)": {platform: Dashboard.Platform.LinuxGTK, tester: true, testCategory: Buildbot.TestCategory.WebKit1},