Android Question Unexpectedly slow number crunching

[Arf]

I've got a sub in my comms service module that constructs packets for sending via Asynchstreams.
I calculate a checksum for the data portion like this:

Log("preparing checksum")
    Do While cnt < sz-1
        oChk(0) = Bit.Xor(oChk(0),oData(cnt))
        cnt = cnt + 1
    Loop               
    Log("checksum done")

I'm finding in some cases that this portion of code can take up to 20 seconds to run with a packet size of 4000 bytes. Why so slow, and is there any way I can speed it up? thanks.

 

[Erel]

Are you testing it in release mode? It will be very fast.

 

[Arf]

Sorry I should have said - no problem in release, slow in debug.

Is there any way I can speed it up in debug? It just caught me out as I'm normally debugging MCUs and forget that execution speed is different in debug on this platform.

 

[Erel]

Is there any way I can speed it up in debug?

Yes. Click on Ctrl + P (clean project) when it starts to be slow, after you stopped the program, and run your program. It will be fast again.

 

[Arf]

Works like a charm, thanks.