Constantin, this has been resolved in upcoming BP 1.6.
you can use the admin bar by adding:
`define(‘BP_USE_WP_ADMIN_BAR’, true);`
to the wp-config,
above where it says:
“That’s all, stop editing! Happy blogging.”
where do i find the wp-config file?
In the root of your WordPress site.
@mercime
==== this has been resolved in upcoming BP 1.6===
WP 3.3.1 Network with WPMU Domain Mapping plugin
BP 1.5.3.1
bp-custom.php – define ( ‘BP_ROOT_BLOG’, 3 );
whenever default BP admin bar is disabled (or not served to not-logged-in users), the following non-existent link appears in source for all sites throughout the network:
/wp-content/plugins/buddypress/bp-themes/bp-default/_inc/css/adminbar.css?ver=3.3.1
… this adds full 3 seconds to page loads.
also, the following appears no matter what in source of all sites:
/wp-content/plugins/buddypress/bp-themes/bp-default/_inc/global.js
if you need help testing version 1.6, drop me a line, glad to help.
@G – looking into the buddypress adminbar stylesheet that bp adds to my site, i believe that that stylesheet has the buddypress specific styles for the ‘toolbar’ (the stuff buddypress adds, such as notifications thus it requires to be in the code (i could be wrong though)
EDIT: You could always remove it if you wanted to – https://codex.wordpress.org/Function_Reference/wp_deregister_style
Global.js – https://codex.wordpress.org/Function_Reference/wp_deregister_script
Woha, thank you all for the answers. 
Is there an expected release date for BP 1.6? I do not like hacking core files that much, so I d rather wait for the next release. As I can see the trac says 82% for BP 1.6 already. . .
@conschneider the last we heard is that it was “planned to coincide closely with the release of WordPress 3.3” Source: https://buddypress.org/about/roadmap/
(@ core devs could we have the roadmap updated to a newer date? )
But, If you dont want to insert the code into your wp-config file, you can put it into your bp-custom.php file which does the same thing https://codex.buddypress.org/extending-buddypress/bp-custom-php/
Buddypress always looks to see if you have a bp-custom.php file in your plugin folder and reads the code in it before it does anything else.
by the way, none of the above (ie: faulty adminbar.css link, or global.js) appear in source on the site using TwentyEleven theme. so i guess it is someting in the other theme that brings it out. i will look further, and try your hacks, guess i put them in functions.php of the offending theme. it was raining so hard here (east coast Australia) my internet was down for 10 hrs, back into it now… thanks Chris.
i solved it. the developer of Suffusion Theme [https://buddypress.org/community/members/sayontan/] had included bad references to BP in the functions.php file. i edited them out, all fine now.
Will update that roadmap page as soon as I get time
Thanks Paul, appreciate it.
Thanks @nilssvz
Your advice to add: define(‘BP_USE_WP_ADMIN_BAR’, true); to the wp-config file along with a customizing plugin such as ‘Custom Admin Bar’. Have made it really easy to customize my admin bar and retain all the needed functionality of Buddypress and S2Member. Awesome!
