docs(migration): mention spinners slow down (#31929)
docs(migration): mention spinners slow down (#31929)


twbs/bootstrap,inway/bootstrap,tjkohli/bootstrap,GerHobbelt/bootstrap,m5o/bootstrap,twbs/bootstrap,inway/bootstrap,coliff/bootstrap,tjkohli/bootstrap,coliff/bootstrap,m5o/bootstrap,GerHobbelt/bootstrap,inway/bootstrap,GerHobbelt/bootstrap