I'm developing an app (XNA Game) for the XBOX, wich is a pretty simple app. The startpage contains tiles with moving gif images.
Those gif images are actually all png images, wich gets loaded once by every tile, and put in an array. Then, using a defined delay, these images are played (using a counter wich increases everytime a delay passes).
This all works well, however, I noticed some small lag every x seconds in the movement of the GIF images. I then started to add some benchmarking stuff: http://gyazo.com/f5fe0da3ff81bd45c0c52d963feb91d8
As you can see, the FPS is pretty low for such a simple program (This is in debug, when running the app from the Xbox itsself, I get an avg of 62fps). 2 important settings:
Graphics.SynchronizeWithVerticalRetrace = false; IsFixedTimeStep = false;
Changing isFixedTimeStep to true increases the lag. The settings tile has wheels wich rotate, and you can see the wheels go back a little every x seconds. The same counts for SynchronizeWVR, also increases lag.
I noticed a connection between the lag and the moment the garbage collector kicks in, everytime it kicks in, there is a lag ...
Don't mind the MAX HMU(Heap memory usage), as this is takes the amount of the start, the avg is more realistic.
Here is another screen from the performance monitor, however I don't understand much from this tool, first time I'm using it...
Hope it helps: http://gyazo.com/f70a3d400657ac61e6e9f2caaaf17587