# Join (still?) running very slow

**URL:** <https://resource.dopus.com/t/join-still-running-very-slow/6973>\
**Category:** Help & Support\
**Created:** [October 31, 2008, 12:17pm UTC](https://resource.dopus.com/t/join-still-running-very-slow/6973 "2008-10-31T12:17:41Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![planetthoughtful](https://resource.dopus.com/user_avatar/resource.dopus.com/planetthoughtful/32/26150_2.png) [@planetthoughtful](https://resource.dopus.com/u/planetthoughtful)\
**Post date:** [October 31, 2008, 12:17pm UTC](https://resource.dopus.com/t/join-still-running-very-slow/6973/1 "2008-10-31T12:17:41Z")

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Hi All,

Just wondering if anyone else experiences very slow performance from the JOIN function?

The SPLIT part seems to be quite quick, but the JOIN is taking forever on a reasonably high spec machine.

I noticed this thread - [resource.dopus.com/viewtopic.php ... =join+slow](https://resource.dopus.com/t/why-is-join-function-so-slow/4189/1) - and wondered if anything concrete was ever done?

This is using DOpus 9.1.1.3.

Out of curiousity, can I hust issue a "DOS-\>COPY filea + fileb + filec filed" to join these files together?

All the best,

pt

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**Author:** ![Leo](https://resource.dopus.com/user_avatar/resource.dopus.com/leo/32/69732_2.png) [@Leo](https://resource.dopus.com/u/Leo)\
**Post date:** [October 31, 2008, 12:42pm UTC](https://resource.dopus.com/t/join-still-running-very-slow/6973/2 "2008-10-31T12:42:49Z")

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The Join command now pre-sizes the destination file but I just tried it quickly and looked with Process Monitor and it's (still?) using a rather small buffer size which may be the reason it's quite slow.

I've reported it to GPSoftware.