There are a lot of people out there who have troubles with the new ICS 4.0.3 update for the Google Nexus S because it's draining the battery and has high CPU load.

Google has stoped the rollout of the update for the moment.

The Galaxy Nexus seems to have a similar problem...

I have made a video that demonstrates a strange effect: The display auto rotation setting seems to have a huge impact on CPU load:
Google Nexus S with ICS 4.0.3 display auto rotation issue (high CPU load and battery drain)

+Android +Android Central
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