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Fix performance issues for the caller/callee flamegraphs in the sandw…
…ich view (#296) This fixes two unrelated problems which together caused performance issues in the sandwich view & made hover tooltips appear to be broken. The first issue was caused by continuously priming the `requestAnimationFrame` loop when it should be a no-op, and the second issue was caused by using different cache keys when trying to access a memoized value in the caller & callee flamegraph components. This resulted in thrash, and especially bad performance because the cache miss was resulting in us re-allocating the WebGL framebuffer on every frame, which is unsurprisingly quite slow. Fixes #212 Fixes #155 Fixes #74 (though this was maybe already fixed)
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