Uninstalled all Minecraft files and reinstalled to make sure system was clean.
Attached are screenshots of a flat world on 1.15.2 and 20w22a.
System is a 2018 MacBook Air w/16GB RAM & Intel UHD Graphics 617 1536 MB.
No issues on 20w21a. Issue started in 20w22a.
Running 20w22a on 2017 MacBookPro which has Intel HD 630 but switches to Radeon Pro 560 has no issues - forcing to Intel shows the same issue.
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However, we are already tracking this issue, and this report is a Duplicate of MC-186075.
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the youtuber PhoenixSC also noticed this, it sure would be nice if mojang was able to get the client and even server performance back to the way it was back in 1.12.2 and earlier. With mob spawning and random tick speed set to false and 0, 1.12 and even 1.13 could reach 35,000, but in 1.14, it was dropped down to 300 tps, still 15x faster than the game runs, but with much less room for error and lag.