Labeling using ArcIMS ArcMap server takes 6-10 seconds longer than normal.
This is caused by an increased number of .MEM files in the temporary directory. Labeling performance decreases proportionally to the number of these files.
.MEM files often get left behind due to crashes, etc. These files are used by the labeling engine as temporary work spaces.
Get help from ArcGIS experts
Download the Esri Support App