Were you able to figure this out? Here's some more information.
The timer interval can be adjusted using the
inputInterval connection string parameter. The default of 33.333333 means it will wait at least 33.333333 milliseconds between CSV file reads (in other words, 30 times per second). The actual timing mechanism can be controlled using the
useHighResolutionInputTimer connection string parameter. You can try changing this setting to see if that has any effect, but both timing mechanisms can be affected by CPU burden so it may not matter.
In short, make sure
inputInterval is set to the default 33.333333 milliseconds, try changing
useHighResolutionInputTimer, and make sure your CPU isn't working too hard.