AS you can see from my log file, it takes almost 10 seconds:
2018-11-28 13:24:31.920 [INFO ] Importing profile archive 'Internet Explorer user.zip' (\\server\uem-profiles\user\Archives\Windows Settings\Internet Explorer user.zip)
2018-11-28 13:24:40.720 [DEBUG] Read 148 entries from profile archive (size: 43858; compressed: 23700; took 8796 ms; largest file: 3677 bytes; slowest import took 8 ms)
I have also tried just to export and import the webcache.dat file, when i exclude that file, it takes under a second to import...