UITableView layer shadow performance optimisation? -


i have got uitableview cells include layer shadow , subviews too. summed have 5 shadows per cell. reuse cells change height when content exceeds height (i because cause more draw calls 'optimisations' enlist below).

now, have added following optimisations:

// setting opaque tell gpu not blend  // layer (-> less draw calls - useful when layer opaque obviously) myshadowview.opaque = yes;  // significant factor shadowpath property,  // smoothed scrolling myshadowview.layer.shadowoffset = cgsizemake(0, -1); myshadowview.layer.shadowopacity = 0.08; myshadowview.layer.shadowradius = 1; myshadowview.layer.shadowpath = [uibezierpath bezierpathwithrect:shad.bounds].cgpath;  // important change myshadowview.layer.shouldrasterize = yes; myshadowview.layer.rasterizationscale = [uiscreen mainscreen].scale;

i very happy performance -- scrolling smooth baby skin -- shouldrasterize property comes drawbacks. when scroll down, takes cell little while load bitmap. there way pre-render cells ? table without reuse identifier rid of problem ?

i absolutely need shadows, not sacrifice performance them. hope someody can help.


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