Refactor RenderGroups (#4993) #30

Job	Run time
Core Basic (18.x)	6m 15s
Core Blocks - Listing (18.x)	5m 1s
Core Content (18.x)	3m 4s
Core Basic (20.x)	6m 44s
Core Blocks - Listing (20.x)	4m 41s
Core Content (20.x)	3m 1s
Core Control Panels (18.x)	4m 13s
Core Control Panels (20.x)	3m 44s
Core Basic - Plone 5 (18.x)	6m 35s
Core Blocks (18.x)	7m 55s
Core Blocks (20.x)	8m 11s
Coresandbox (18.x)	5m 30s
Core Volto Slate (18.x)	7m 0s
Core Volto Slate (20.x)	7m 18s
Multilingual (18.x)	4m 24s
Deployment Mode (18.x)	6m 18s
Project Generator (18.x)	6m 53s
Multilingual in Deployment Mode (18.x)	3m 42s
Working Copy (18.x)	3m 55s
Project Generator (20.x)	6m 30s
	1h 50m 54s

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