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Skip startup animations with startDelay #748

Job	Run time
Test Build	27s
Test Browser on macOS (safari, default)	2m 15s
Test Browser on Linux (firefox, default)	1m 39s
Test Browser on macOS (safari, disabled)	1m 42s
Test Browser on macOS (safari, main)	57s
Test Browser on Linux (chrome, disabled)	1m 4s
Test Browser on Linux (chrome, main)	40s
Test Browser on Linux (firefox, disabled)	1m 15s
Test Browser on Linux (chrome, default)	1m 10s
Test Shell (jsc, disabled)	1m 47s
Test Shell (spidermonkey, default)	5m 17s
Test Shell (spidermonkey, disabled)	2m 14s
Test Shell (spidermonkey, main)	43s
Test Shell (jsc, default)	2m 58s
Test Shell (v8, disabled)	1m 33s
Test Shell (v8, main)	41s
Test Shell (v8, default)	2m 46s
Test Browser on Linux (firefox, main)	39s
Test Shell (jsc, main)	38s
	30m 25s