Have you installed a custom recovery using the fastboot command yet? You need to have a custom recovery installed prior to updating with the bigpart version.
if your device is a lumia switch to nokia music, if not then hopefully m$ will fix it. my files aren't being displayed properly either with xbm, but nm nails it
ICS firmware with cdma radio (no lte), gimped search, new kernel and keyboard. could be more but those were the biggies that i noticed from a flash and see
The problem is none of the wireless carriers in the US want to build enough capacity into their data networks. Until they do that data slow down is inevitable.
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if you have betterbatterystats and see modem_usb_gpio_wake at the top of kernel wakelocks a bad signal is probably the culprit.
some batery cycles for me last 13 hours, others go 36 plus... and that particular wakelock is always at the top of the list when battery life blows