IPad is slow in processing Thai characters

Hi
I'm Thai and I use my iPad a lot for reading and writing. The iPad slowness has been an issue for me for so long. At first, I thought it was some apps that heavily use resources of my iPad, so I tried closing all inactive apps or restarting which doesn't help. The problem occurs only occasionally, so I decided to be patient and live with it. However, lately I found that this slowness seems to related with processing or displaying a lot of Thai characters.
The first app that the behavior is obvious is iBooks. It takes a good amount of time (minutes) to load a Thai book with about 200 pages, and many seconds just to flip a page. I have another English book that longer than thousand pages and it opens almost instantly without waiting for flipping through pages.
Safari is the other app that shows the same behavior. It takes a lot of patience to read a page with a lot of Thai characters. It freezes and unresponsive when I scroll down the page or click the link so many times. I even used to think that my iPad really freezes, but it will come back if I just wait long enough. Never had this happened on English pages.
The last app that I found this occurs noticeably and I just tested it intentionally today is DayOne, a journal app. My journal writing (in Thai) became painful that I needed to switch to use my macbook instead because of typing lag. I used to blame the bluetooth keyboard and the app itself. Today I copied a pretty long English article into my journal entry and then continued to write after it. The lag was minimal and didn't affect my writing, so I switched to Thai. After only 5-6 lines, the typing lag came back to the point that I can't continue. I tried deleting only the Thai part and the problem solved!
This is very strange to me and please correct me if you think I reach a wrong conclusion, but this is what I've observed. If I remember correctly this issue has been occurring after upgrading to iOS 7, and it is an iPhone issue as well. It's just not obvious because I don't read and write this much on iPhone. If anybody have seen this and know the solution or have any suggestions please let me know. Thank you in advance.
SC

The only things you can do on an iOS device are to restart apps as suggested by Lance or reset the device:
Otherwise let Apple know the details of the problem via
http://www.apple.com/feedback

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