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Hi, when initiating the camera my xz can take up to 30seconds to get the camera open, and when filming my xz takes only about every fifth frame as it is too slow. When unlocking the phone, it takes about 15 seconds to get to the home screen. It's been like this since new but I cannot handle it anymore. Anyone else with similar problems?
This looks odd, I'd suggest that you perform a software repair using Xperia Companion. This will do a clean installation of the latest firmware and will also wipe your internal memory. Don't forget to backup using Xperia Companion, but preferably without adding apps or settings to the backup.
Follow the steps given in blue links, and keep us updated.