I never seen such a problem.
I dragged last week 800 tracks, Engine dj analysed them in like 3 minutes.
All accurate and on spot with the beat grid.
What are Your computers specs?
I have over 250000 tracks in my collection at this moment.
My old macbook with i7 3’rd gen and 16GB RAM was also fast in analysis (100 tracks was taking about 5 minutes).
Can You check what is running with Engine in the background?
Maybe there is something that pulls resources of Your machine during analysis, so Engine can’t use the full potential of Your computer.