The Mix Lab V31 skin for Virtual DJ 7 comes packed with features aimed at improving workflow:

Mix Lab 3.1 on VDJ 7.4 or Skin with EQ Crossfaders - VirtualDJ

: Open your software. If it was already open, close and restart it.

If you are using a modern controller (DDJ-400, Numark Mixtrack), you can still run VDJ 7 with a mapping script, and the V31 skin will display your levels and loops instantly.