Conversion wand works fine on my server, but as soon as i use Infused wood as the replaceing or replaced block it lags the server to 2tps and takes a good 30 seconds to convert... it is strange how it works better with other modded blocks then it's own mod.

Lacks information. How is it used? Keep circumstances such as lighting updates when building "flooring" in a skyblock map or related in mind.

Sorry for the delay in response... i did some more testing, it seems to only be when i am replacing horizontally instead of vertically and to do with the amount of blocks i am replacing, is there a way to customize it to only do 12 blocks at a time to see if that stops the massive lag: https://imgur.com/a/IfL90ia it's not just Infused wood, i was doing this part with Dreamwood.

Edit: I also added tps after clicking multiple times just to show how easy it would be to grief a server with it. The TPS does spike low even if i do wait for the conversion to take place (but not this low) [this was clicking 3 times on different blocks]

Looks like lighting updates based on that.

So is that on our server's end or mod side?

Should be serverside, but if you could run a visualvm profile while replicating, would help verify there's nothing being exacerbated by the mod.

@Chocopuffs just wanted to check in on this again, see if there was any profiling that had been done. I'm not seeing anything like this in my testing that's not related to lighting updates.