Serial jitter

I've been thinking about using an Arduino to communicate with Max patches over USB but I ran across this old forum thread that has me concerned about potential jitter issues. Have these problems been solved since then?
http://forum.arduino.cc/index.php/topic,38588.0.html#11

Have these problems been solved since then?

In your code? Who knows? Only YOU can see it.

Excuse me? As I read it this is a problem with the USB serial driver.

Why the rude reaction? What did you hope to accomplish with that?

Plenty of people have sent serial data to and from the Arduino at high rates of speed, with no problems. Why do you think you are going to have a problem?

Why the rude reaction?

You obviously haven't seen me be rude, you dumb ass.

OK, well, now you have. So, you can see rude.

The USB system is not designed to provide accurate timing and its performance can be very poor if you only want to send a few bytes at a time.

You may find this FTDI paper useful.

You should design your system with an adequate buffer to smooth out any short interruptions in data flow.

...R

As Paul subtly alluded to, more info (including your code) would be useful for others to help you. The thread you linked to is 8 years old. That is very, very old in Arduino land.