The response time of wifi in ios 5.0 is now much slower then in iOS 4.2

The response time of wifi in ios 5.0 is now much slower then in iOS 4.2.
It takes sometimes 30 sec till 1 minute that something happend.
I have an iPad 1 64gb with 3G..

Looks as if it is to do with your iPhone, if it can't find any Wi-Fi networks and they are turned on and set to discoverable, even after restarting the router it's still unable to find it my recommendation is to do a restore through iTunes, the update may not have installed properly, I have an iPhone 4 16GB (Black) running iOS 5.0.1 and it finds my Wi-Fi networks and log's onto them no problem, so clearly the software works, just seems that your iPhone is having a bad time
You've done everything else I'd reccommend, normal re-boot, soft reset, reset network settings.
Think it's time to do a full back up in iTunes and do the restore, then see if that resolves the issue, be sure to let us know how it goes if you do decide to do this.

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