vb.org Archive - Help to Migrate from Drupal forum to VB

Hello,
I have a busy Drupal 6 site and forum. I'd like to migrate the whole forum to VB. The reason is to off-load the site traffic and hopefuly get better performance and control that VB forum offers.

I am wondering whethere there is some migration tools to move content from Drupal to VB?
I've read that there is a Impex System to do the migration but it does not migrate passwords. Is it true? Has anybody actually used that method?
Should I expect better performance and scalability in VB in comparison with Drupal forum?

I appreciate you hints and will be greatful to hear firs-hand experiences about the migration.
Thanks

X vBulletin 3.8.12 by vBS Debug Information
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X vBulletin 3.8.12 by vBS Debug Information

Page Generation 0.00970 seconds
Memory Usage 1,703KB
Queries Executed 10 (?)

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./includes/class_hook.php
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Hooks Called:

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Messages:

X vBulletin 3.8.12 by vBS Debug Information
Page Generation 0.00970 seconds Memory Usage 1,703KB Queries Executed 10 (?)
More Information
Template Usage: (1)ad_footer_end (1)ad_footer_start (1)ad_header_end (1)ad_header_logo (1)ad_navbar_below (1)footer (1)gobutton (1)header (1)headinclude (6)option (1)post_thanks_navbar_search (1)printthread (1)printthreadbit (1)spacer_close (1)spacer_open Phrase Groups Available: global postbit showthread	Included Files: ./printthread.php ./global.php ./includes/init.php ./includes/class_core.php ./includes/config.php ./includes/functions.php ./includes/class_hook.php ./includes/modsystem_functions.php ./includes/class_bbcode_alt.php ./includes/class_bbcode.php ./includes/functions_bigthree.php Hooks Called: init_startup init_startup_session_setup_start init_startup_session_setup_complete cache_permissions fetch_threadinfo_query fetch_threadinfo fetch_foruminfo style_fetch cache_templates global_start parse_templates global_setup_complete printthread_start bbcode_fetch_tags bbcode_create bbcode_parse_start bbcode_parse_complete_precache bbcode_parse_complete printthread_post printthread_complete
Messages: