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# Compustream performance improvements and interactive wall drawing
I found some time to further develop my GLSL compute shader based interactive LBM fluid simulation previously described in [_Fun with compute shaders and fluid dynamics_](https://blog.kummerlaender.eu/article/fun_with_compute_shaders_and_fluid_dynamics). Not only is it now possible to interactively draw bounce back walls into the running simulation but performance was greatly improved by one tiny line:
glfwSwapInterval(0);
If this function is not called during GLFW window initialization the whole rendering loop is capped to 60 FPS -- including compute shader dispatching. This embarrassing oversight on my part caused the simulation to run way slower than possible.
<video controls="" preload="metadata" loop="true" style="max-width:100%" poster="https://static.kummerlaender.eu/media/compustream_with_walls.poster.jpg"><source src="https://static.kummerlaender.eu/media/compustream_with_walls.mp4" type="video/mp4"/></video>
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