If you are struggling with higher than expected response times when using the TravelTime tools in ArcGIS Pro, then below are some tips to speed things up!
Combining Departure/Arrival layers with Departure/Arrival searches
For a Departure search, use the layer with the fewest points as the Departure Locations
For an Arrival search, use the layer with the fewest points as the Arrival Locations
Relevant for Time Filter Simple and Time Filter Advanced
Reduce the Travel Time parameter
The lower the value of the Travel Time parameter, the faster the response time
Particularly relevant for Time Filter tools, where any locations not reachable within this travel time can be marked as Unreachable
Disable the Range parameter
Enabling Range expands the search space of the tools, reducing performance
Relevant for all Advanced tools
For more information on how the Range parameter works, please see the Advanced Parameters tutorial here
Reduce the number of locations
The greater the number of isochrones / routes / matrices, the longer the tools will take to run
For example, the below times are for the TimeMap Simple tool, creating 60 minute driving isochrones on layers of different numbers of points
For particularly large data sets, it may be quicker to break the data down and run the desired tool on multiple smaller data sets before recombining - for example in the above analysis, the time taken to generate 1,000 isochrones is more than 2x the time taken to generate 500 isochrones
Use Time Filter tools to calculate travel times, not Routes
The Routes tools are designed to be used when either a visual of the route is required, or a breakdown of the turn-by-turn directions
Time Filter tools are designed to be used when the journey times between large numbers of origins and destinations are required
Using the Routes tools to calculate journey times will be significantly slower than using the Time Filter tools