I would love to be able to draw a box over a bit of code on the block diaghram and be able to highlight execution just for what's in the box. The rest of the code should execute at full speed. This frequently becomes an issue when you are trying to track down a bug in a big program and you've got to wait for ages to get to the bit your interested in.
Available in LabVIEW 2019 and later. Right-click any wire and select Custom Probe > Toggle Execution Highlighting. Place one of these probes before and after the section of code you want to run with highlight execution enabled.