Uses the Barnes-Hut algorithm to avoid O( n^2 ) force calculations in favor of O(n log n). Simple nearest neighbor tracking cannot be use in gravity simulations as gravity has an effective infinite ranged potential. https://en.wikipedia.org/wiki/Barnes%E2%80%93Hut_simulation
I got that too when i opened the tab in background. Chrome 70, console says:
Active resource loading counts reached to a per-frame limit while the tab is in background. Network requests will be delayed until a previous loading finishes, or the tab is foregrounded. See https://www.chromestatus.com/feature/5527160148197376 for more details
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[ 0.30 ms ] story [ 23.3 ms ] threadActive resource loading counts reached to a per-frame limit while the tab is in background. Network requests will be delayed until a previous loading finishes, or the tab is foregrounded. See https://www.chromestatus.com/feature/5527160148197376 for more details
Works fine after page reload.