R studio bio3d so slow or not running – General

Hi,I have ben using R studio bio3d package for my molecular simulation analysis for three months.but for three weeks,it takes so long loading my files and when ı loaded my pdb and dcd files, then it is not running.many times ı have uninstalled and reinstalled.but it still continue.
Written my codes:
pdb<read.pdb(“”)
dcd<read.dcd(“”)
ligand.inds<atom.select(pdb, resid=“B”)
xyz<-fit.xyz(fixed=pdb$xyz, mobile=dcd, fixed.inds=ligand.inds$xyz, mobile.inds=ligand.inds$xyz)
Could anybody help me for this issue please? How to fix this issue