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The middle bar is the script run percentage. This is how much of what scripts want to do per frame is actually achieved. A score of 100% means everything that should have happened did happen. Anything lower means that scripts are not running at optimal speed. This can cause problems with timings going wrong, slow response and sometimes more serious issues when assumptions about the sequence of events inside a script are broken because of the effects of slower script execution. This bar is an inverse bar - no colouring/no bar showing means 100% script run was achieved. The more coloured bar there is the lower the script run percentage. If you hover the mouse over the bar a popup will appear containing the current value.
If the middle bar is empty all scripts are getting all the time they need. In this case, the remaining two indicators can be treated as just informational although they will give hints on likely points where performance will degrade (eg a high amount of script time or a low amount of spare time).
The next one along is script time per frame. This is how much of each frame (around 22ms) is used for scripts. The higher the number the more time is going on scripts. This is not necessarily bad in itself so long as the region is achieving 100% script run as well. However, it is an indicator of a region well loaded with scripts.
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The statistics can be viewed in more details detail on either of the statistics floaters accessible by CTRL-SHIFT-1 for Statistics (most viewers) and CTRL-SHIFT-8 for Script Statistics (Kokua specific).
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