Add speculative loading support #14329

Job	Run time
Core running from build / Core running from build / Linux	2m 11s
Core running from src / Core running from src / Linux	2m 2s
Core running from build / Core running from build / Windows	4m 25s
Core running from src / Core running from src / Windows	3m 30s
Core running from build / Core running from build / MacOS	2m 5s
Core running from src / Core running from src / MacOS	2m 17s
Gutenberg running from build / Gutenberg running from build / Linux	8m 53s
Gutenberg running from src / Gutenberg running from src / Linux	8m 43s
Gutenberg running from build / Gutenberg running from build / Windows	11m 37s
Gutenberg running from src / Gutenberg running from src / Windows	11m 58s
Gutenberg running from build / Gutenberg running from build / MacOS	8m 51s
Gutenberg running from src / Gutenberg running from src / MacOS	10m 58s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 17m 30s

Provide feedback