Greg is right, but a couple of things are to be noted :
- first, ofx performance is lower than anything else in any situation; if you're warned and ok, you won't be bothered but you have to know first;
- standalone Fusion only used OpenCL and sometimes is worst than jobs using cpu only; now that Fusion is included in R15, some issues may happen too (so the option to "use cpu only" appears in preferences too). In case you're on CUDA, don't rely on it either of course, and in general, I wouldn't rely on gpu acceleration at all for Fusion at this point.
Now, yes, Mocha is great, of course. And I love it...
Byt I personally decline using it for stabilization only because as you read here, the ofx WF is not satisfying so far and export/import is too heavy too just for stab, so I tried harder to get around inside Resolve...
I admit sometimes I don't find a reliable solution in Resolve, especially when it produces some kind of weird warp + blur in the stabilized image : this is usually the step when I know I won't find a solution in Resolve, even by tweaking options a lot...
Then... export > mocha > import

I admit...
*MacMini M1 16 Go - Sonoma - Ext nvme SSDs on TB3 - 14 To HD in 2 x 4 disks USB3 towers
*Legacy MacPro 8core Xeons, 32 Go ram, 2 x gtx 980 ti, 3SSDs including RAID
*Resolve Studio everywhere, Fusion Studio too
*https://www.buymeacoffee.com/videorhin