Forwarding this to haskell-cafe as it failed before. On 18 August 2014 20:24, Kaspar Emanuel wrote:

Hi,

are there some simple tricks to reduce the CPU load? This simple square rendering sits at 20% CPU even when the window size remains constant.

import FRP.Helm import qualified FRP.Helm.Window as Window

render :: (Int, Int) -> Element render (w, h) = collage w h [move (100, 100) $ filled red $ square 64]

main :: IO () main = do engine <- startup defaultConfig run engine $ render <~ Window.dimensions engine

The binary fractal tree I submitted in another thread on helm-dev sits at 100% CPU when the mouse isn't moving. It seems to me that Helm keeps re-drawing and re-computing when it doesn't need to.

I started digging through the source a bit but it will take me a while to understand Elerea and how it samples the inputs and causes things to update.

Are there any quick fixes?

Ciao,

Kaspar