https://issues.dlang.org/show_bug.cgi?id=24289

          Issue ID: 24289
           Summary: Adopt the "rund" tool as a much faster alternative to
                    "rdmd"
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: tools
          Assignee: nobody@puremagic.com
          Reporter: siarhei.siamashka@hotmail.com

Right now the performance of "rdmd" is much worse than the performance of "go run" when invoked to run a freshly edited source file in a script-like fashion.

But https://github.com/dragon-lang/rund/ is able to reduce the performance gap and make D language much more attractive and competitive.

I propose to add "rund" to https://github.com/dlang/tools/ and distribute it as a standard part of the DMD compiler binary releases. Also update the documentation at https://dlang.org/rdmd.html to recommend "rund" instead of "rdmd".

Or alternatively update the "rdmd" tool itself to address its performance problems. Essentially consider bringing back the reverted https://github.com/dlang/tools/pull/271

Extra links:
* https://forum.dlang.org/thread/fqziujkpdbivsqxsgszu@forum.dlang.org
* https://forum.dlang.org/thread/tgpvmzbhlxljwpqmbufu@forum.dlang.org

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