I had 5 pawns with it before I realized what was causing my slowdowns when they meditated and couldn't fix it with dev tools or anything so this was the work around I found, hope it helps

Good to know, was struggling with this... Massive performance drop during the meditating hours.

You can also use the dev mode command to reset psycasts. It doesn't add the extra point you get when the pawn first get's their psylink, but you can just check the dev mode box to add the first tree and then uncheck it after.

There's different types of meditation? huh..

How do you know which meditation type is best for your pawn? I've just been having them meditate at an anima tree

-None (no bonus)
-Artistic
(scales based on the value of art within view of meditation spots aoe)
-Morbid
(scales based on relationship between pawn and buried pawns, or just quantity within aoe until relationship is available)
-Natural
(works with tree to get vanilla psylink ritual BUT only works for tribals, also scales with natural objects nearby, rune stone, anima stone, natural sculptures/altars, they'll say if they are one)
-Dignity
(works with thrones and the impressiveness of the throne room, needs to be Imperial noble rank though)
-Science
(scales based on the number of research based items in range and possibly the cleanliness of the room)
-Minimal
(scales based on the number of minimal objects in the room, good for barebones meditation but limited)
-Archotech
(scales based on the number of archotech tier items, like teleporters, cornicopia/shock lances consumables, etc in the aoe)
-Wealth
(scales based on the wealth of the room they are meditating in, works best if you put it in your store room/throne room with storage shelves and majority of your loot)
-Group
(scales based on the number of pawns within range of the aoe that also have the group perk, keep in mind this one in my experience causes major lag any time the pawn with the type is meditating, group or otherwise)

All of this to say, the more modifiers a pawn has, the more impact they have on your performance while meditating and the only way to remove types is to remove the Hediff (both of them) of Psylink Level # to reset the pawn, then use the dev mode command that resets psylink stuff, saving your game, reloading your game, giving them a neuroformer, dev mode releveling them, and being careful not to give them levels with godmode active because then it won't use skill points

I had a colony of 20ish colonists 15 of whom had Artistic, Minimalist, and Morbid, several who also had Natural, and a few others that had Dignity

My game runs at about 7x speed most of the time and with half of these pawns meditating, my game speed dropped to more akin to 1x or 0.7x speed while on 7x speed setting

So probably best to pick one and go with it as hard as you can, natural being the most ideal because they can give more psylinks to other natural meditators