What are Rapid Exit Taxiways
They are taxiways which allow for quicker exit of the runway.
As you can see it should allow for an aircraft to exit faster than a standard 90 degree exit as demonstrated further up the runway.
In IF as soon as you exit the runway you are limited to 35KTS. To ensure you do not receive a violation nearly everyone leaves this exit at 35 KTS or less to avoid a violation.
My Suggestion is that the speed is increased to 50KTS until you join the “Straight Taxiway” as shown on this image. This would make life much easier when it is very busy as aircraft landing will spend less time on the runway allowing for planes to get out slightly faster.
You may questions why is it needed however it is used IRL and will make things slightly easier for controllers.