We neither limit nor control the bandwidth used by Remote Utilities. It always uses the full bandwidth. I'm afraid that the issue is elsewhere. BTW, do you 16-bit color or 16 colors? These two are different things.
If you are connecting directly using the IP address of the remote PC, there shouldn't be any issues with speed provided that you have good network connection.
Also, please note that different programs have different initial (default) color settings, and some of them can even automatically adjust the quality depending on the speed "better". If you want to compare apples to apples, just set exactly same connection settings in different programs.
Please, note that we do not tolerate comparative and general statements like "Product X is better (faster, cheaper etc.) than Remote Utilities" here on this forum. All such messages will be deleted without warning and the user will be banned.