Hi Anand,
As long as you are not seeing any error in the log it is running fine i think.
regarding of slowness is depends on many things. for more information check below notes.
1918279 - performance analysis for ACT_UPG phase
1674812 - Performance improvement for ACT_UPG
https://wiki.scn.sap.com/wiki/display/SL/Analysing++activation+errors+of+single+objects
Thanks,
Venkat