tweaks to speed up cose
tweaks to speed up cose

CoSE animation start threshold #1131

a few thousand elements run near instantly (300ms - 500ms)

KonstantinShemyak/cytoscape.js,soomin-maeng/cytoscape.js,soomin-maeng/cytoscape.js,rlugojr/cytoscape.js,rlugojr/cytoscape.js,KonstantinShemyak/cytoscape.js