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It's been reported before, I guess the terrain type under the meteor doesn't get saved. If you mine right after impact you get soil, if you save, load and mine you get stone floor.
I hope by RimWorld 5 we get realistic rock erosion, accumulation of sand and decomposition of plant matter to combat this in those hundred-year colonies.
[A18.1712] Granite meteorite on Ice Sheet leaves rough-hewn Granite floor when m
[1.1] Meteorite rock creates rough-hewn rock floor when mined after reload

I see your point. Camelid leather maybe, there is already panthera fur.
It's getting pretty technical, considering we are still picking chocolate bars from cocoa trees.

Leathers were simplified in beta 19 to reduce the accumulation of small scraps of leather.
There used to be rat leather, squirrelskin, boomrat leather, catskin, yorkieskin etc.
Alpacahide got merged with camelhide.
https://ludeon.com/blog/2018/08/rimworld-beta-19-released/

In other words, drafted colonists ignore area restrictions and you can capture drafted and undrafted.
Way back in alpha 13 it was decided that drafted colonists should ignore allowed areas due to pathing weirdness.
[A13] Allowed area has weird effect on drafted colonists pathfinding
I don't see anything really wrong here.

Support seems to pretty much roll on volunteer power. And the number of people that both
(1) use a mac
and
(2) consider reading the support and bugs forums an interesting activity
approaches zero.

I don't use a mac either, but since no-one else is stepping up, I am doing the equivalent of flinging spaghetti against the wall and seeing if it sticks.
I am just going to assume that you are not using any mods.
It's propably not a hardware issue, and propably not an issue with RimWorld itself.
Between RimWorld 1.0 and 1.1 the Unity engine it runs on was updated from 5.6.5 (December 2017) to 2019.2.17 (December 2019).
It is known that some software such as BTT doesn't play nice with the newer Unity engine.

Both of your macs are affected, therefore it is propably a piece of software that you have installed on both machines that is causing this issue.
If I were you, I might start removing or disabling software one by one, checking if it starts working. Or make backups, wipe everything and start building up from scratch. When RimWorld starts lagging again, you've found your culprit. Again, I am not a mac user and don't know of any better way.

(Not responsible for data loss due to faulty or non-existent backups. One backup is zero backups. An untested backup is not a backup.)

It's great that you report bugs, but honestly you should read the sticky.
Sounds like you should post the save, and the whole log. If your game is modded, it propably should go to mod bugs instead, unless you can reproduce it without mods.

And did you have BetterTouchTool or something similar that watches your mouse for gestures? Try disabling that.

On a mac, perhaps? BetterTouchTool creates mouse issues with games that use a new Unity engine.
https://community.folivora.ai/t/mouse-lag-in-newer-unity-games-with-window-snapping-active/10492
[1.1] Slow or eaten click inputs since 1.1 on Mac [solved, BTT conflict]

Orbital or outlander combat suppliers don't buy or sell simple or "flak" helmets. Or plate armor. It seems weird.
They are propably under StockGenerator_Clothes instead of StockGenerator_Armor.
Adding them under armor propably makes marine/recon helmets and armor rarer, since all armor traders roll from a bigger pool.

DrakeFS has the same bug with a save. [1.1] Grand Stele replaced a wall of a ancient evil
His settings (seed: arthur, coverage 30%, 1.79°N 2.60°W, everything else default) generate an ancient danger breached by steles in unmodded 1.1.2575.

I have seen this a couple of times in earlier versions, but can't reproduce it. There must be some specific condition that triggers this bug.
I have always used unmodded 64-bit drm-free Linux versions, Finnish keyboard layout, English everything else.

This bug was fixed two weeks ago. The known solution is to update. The link you got in the mail when you purchased the game always has the latest version.
[Royalty 1.1.2558] Unable to form a caravan. "Make sure one side is reachable"

Go-juice withdrawal produces these edge cases, where the guest is trying to crawl away but passes out before reaching the edge of map.
You could just administer go-juice. There is no goodwill penalty for giving addicts the fix they need.
And I just checked, and there is no penalty for installing peglegs if your visitor's legs should happen to fall off while passing by.
Also, other visitors can rescue your incapacitated guest if they belong to the same faction as your guest.

Your unconstructed cooler is leaking the prisoner area to your freezer. Food in prisoner area is reserved for prisoners only. Deconstruct the sleeping spots and they rush for the meals.
May I also suggest that you unroof a small room and use that as a chimney for your coolers, venting hot air from freezer to indoors in a tropical rainforest is not ideal.
...
Is it actually mentioned anywhere that food in prison gets reserved, or is it just tribal knowledge? The tutorial ends when the first raider is downed, and I don't think there is a learning helper entry for it.

Propably the same bug as [1.1.2565 Royalty] Potato Harvest Decree miscounting harvested potatoes.