Since I was using Google Chrome I didn’t get any error messages. Using Mozilla Firefox I got this error message:

A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete.
Script:http://ralfengel.com/wp-includes/js/jquery/jquery.js?ver=1.2.6:11″

The slow loading of the “Write Post” page in WordPress MU is caused by the execution of a script which loads all the meta data of all the posts (wp_postmeta). I believe that my dirty install (I imported allmost 400 posts with comments from my old WP installation) caused this. I had to repeat the upload several times for each file part (can’t upload (import) 4 mega bites using the import function of WordPress, thus I broke it up into 4 parts), since the uploads wouldn’t complete correctley.

There are two ways to fix the problem. You can either edit your edit-form-advanced.php file in the wp-admin folder or you can do a clean up in your database by running a query.

Edit the edit-form-advanced.php
Open the edit-form-advanced.php file found in wp-admin folder in an html editor and navigate to line 306 (for WPMU 2.6.5). You will see the following code there:

<?php
$metadata = has_meta($post->ID);
list_meta($metadata);
?>

You will have to delete this code. Save the file and upload it to your wp-admin folder. Refresh your “Write Post” screen. It should load within the usual 3 seconds. That is all, you’re done.

2. Clean up the WordPress Database using a query
To do a Database cleanup you will have to log in to your MySQL Database on your Server.
Once you are in PHP my Admin you should see your database name on top left and below all the tables it contains.
On the top of the right big window you should see a “SQL” tab. Click on it. Now paste the following code into the “execute query” window.

DELETE FROM wp_1_postmeta WHERE post_id =0;

DELETE FROM is the command line. wp_1_postmeta is the table name in MY database. You will have to change this to the name of your postmeta record name. This could be wp_postmeta or wp1_postmeta or something like it.
Hit the “execute query” button. You should get a report stating how many records where deleted. In my case there were some 3500 records with post_id=0.
After refreshing your “Write Post” window, you should get the page loaded in the usual 1-3 seconds.

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