[diggwhacy (OP)]

hi. i am new user
and i would to ask community, most powerful forum engine is?
mybb etc? thanks digg

[nicephotog]

Not seriously a good way to look at the software in context of a "forum".
IF you wanted the "paramount" piece of software in a forum to decide its best value as forum software, it would actually be its search operation algorithms , in short its "search engine" accuracy, flexibility, conciseness, usability and machine efficiency of its routines to produce a result sets list.
Most forums are built on an "A typical" standardized system of supplied parameters (of a forum) to list the newest posts first, supply editing systems and topic grouping sets of threads, and handle user security and registration of users.
If anything stands out for use in a forum as good forum software, it is result set return speed of a search, and topic thread posting sets retrieval speed of the machines routines.
However, much of the forum "A typical" software system is a combination of front end scripting to server side intermediary to back end server scripting such as PHP, PERL, Python, Ruby or Java2 that joins to the records to either search or keep in some form of SQL database, e.g. Postgre or MySQL are common storage containers that also have language and machine routines  that the searches are actually  committed by.
So the problem of whether you have a fast efficient forum is really the database language correctly constructed for result sets and search terms and to a less extent the intermediary server scripting language of the CGI for request handling and render to the client.
Databases such as MySQL and Postrge have methods of configuring the AKA "database engine" for types of data and throughput apart the initial setup of the data types of the tables and rows, also specific language keywords and commands to increase efficiency of searches and retrievals.
e.g.
https://dev.mysql.com/doc/refman/8.0/en/fulltext-natural-language.html