Yes. Although BriskVM is relatively fast, this will necessarily be slower. Scripts are best to be used for high level code, and in this area the speed hit can be neglected. On the contrary, doing massively CPU intensive computations in scripts is a bad idea. So it all depends on how complex and repeated your bank accesses wil be.
In any case, if you're unsure you can use the trial verison of BriskVM to see if it's fast enogh for what you plan to do.
In any case, if you're unsure you can use the trial verison of BriskVM to see if it's fast enogh for what you plan to do.