Graph doesn't update until I hit a breakpoint or pause

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Hi,

Running into a strange issue. I'm using MATLAB app designer to record data coming from a serial port at a high rate (500-1000Hz) and as part of my program, I am plotting onto a a graph after running the data through a filter. While it seems reasonable that the rate of update would be slower after running it through the filter, what appears to be happening is that the graph isn't being updated at all. However, if I set a breakpoint in the program, the graph WILL update. Am I doing something wrong?

Thanks.

EDIT: I'm running the following code in a forever loop. The code is run if there is less data in the serial port than I collect per loop iteration, so it should update if updating won't cause the buffer to fill up.