J2ME Application is slow even when the thread is finished

Hello everyone
I've been searching for a solution for a whole day but haven't found any thing.
My problem is that when I start a thread, after it finishs, my application seems to be a bit slower. The more I repeat, the slower it seems.
Does anyone know how it can be that? I tried to just do a simple work such as assign i = 1; in the run() method of this thread, so I am pretty sured that the thread finished completedly.
Thanks in advance

- how are you forking the thread? [show code]
- is the lag in the emulator or on the device?
- what ide/device are you using?

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