EPANET_MTP4-r2_Water-quality-playback-is-slow for large network

[ucchejbb]

In attempting to run a larger network model (>10K nodes) with water quality results, the playback was very slow. This resulted in a flickering behavior as it rendered the map, and it would sometimes leave a half completed map visible as it began to render the next quality timestep.

Also, it is unclear what some of the options do on playback. In selecting the time dialog box, it didn't seem to change playback.