intruder speed is as slow as free edition when i have professional
intruder speed on professional slow for me i don't undertstand why
The Intruder tool is the same across both the Community and Professional editions of Burp.
The speed of the tool could be due to a number of factors including the resources on the machine that Burp is running on and the performance of the actual web application that you are testing.
In Intruder → Options → Request Engine there are options that you can configure to fine tune the engine that is making the Intruder requests. I would suggest that you read the following link in order to familiarize yourself with the options first:
Please let us know if you require any further information.