If you are near the ghast every action of the mobs and players will be slown down. The 3 following attachments will show all of the actions.
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@[MCPE MOD] Auldrick It appears that I have no background apps running. I don't know if anyone is having this issue like me but to reproduce this, you must have a ghast near you preferably use a repeating command block and reproducing the actions shown in the attachments.
Are you saying you have a repeating command block running when this happens? Depending on what command it's running, that could certainly be a big part of the problem. Repeating command blocks run their command every tick. If you have one with a command that searches your ticking area (e.g. any command with a target selector and no range restriction), and you also have your simulation distance set high, it could use up a lot of your device's power. I would see whether disabling the command block resolves the issue.
Other than that, make sure you don't have any resource or behavior packs active. Packs intended for earlier releases could potentially cause performance issues.
I wasn't able to reproduce your problem, even with a ghast next to me, a bunch of other mobs around, and a repeating command block executing a testfor @a command (with no range restriction). But that's hardly surprising, since I was testing on a tablet PC (I don't have a mobile device) with about twice as much memory. My Server Time was under 5 ms/50 ms. By the way, I just noticed that your memory usage is maxed out too.
Cleaning up old tickets: This ticket has not been updated recently so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
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Notice that the Server Time shown in the Beta heading indicates that your device is taking from 3 to 6 times as long to generate one tick as it should. Are there background apps running that could be taking too much time? Can you reproduce this after restarting your device?