I originally posted this on the 4.3 discussions thread but its getting lost in the noise.
Try installing (if you already have it, upgrade it) the Chrome Browser for Android from the Google Play site and see if your problem goes away.
I already had Chrome Browser on my S3 and had all the lag and restart issues. The latest version of Chrome Browser (18th Nov) fixed all these issues. I'm not suggesting that this is a 4.3 fix. Its definitely a work around though. Its like I've got a new phone.
Problems that this fixed for me and a few other users are:
Lag after pressing home key or power button from sleep
Random restarts
App crashes
Wi-Fi drop outs
Try installing (if you already have it, upgrade it) the Chrome Browser for Android from the Google Play site and see if your problem goes away.
I already had Chrome Browser on my S3 and had all the lag and restart issues. The latest version of Chrome Browser (18th Nov) fixed all these issues. I'm not suggesting that this is a 4.3 fix. Its definitely a work around though. Its like I've got a new phone.
Problems that this fixed for me and a few other users are:
Lag after pressing home key or power button from sleep
Random restarts
App crashes
Wi-Fi drop outs