https://wccftech.com/pixel-android-8-1-causing-lag-heres-how-to-fix/ >Google started rolling out Android 8.1 Oreo January Security Patch last night. Available for the compatible Pixel and Nexus devices, some users reported performance lag on their Pixel phones following the update. The problems range from slow animations to delayed app launch time. Google, however, suggests that the problem arrives only for those users who manually sideloaded the latest security patch instead of waiting for the OTA update. >The company adds that instead of sideloading the January patch, update via the OTA. Some users who did flash the update manually also note that rebooting appears to fix the lag issues too.