These are some of the directive you can use to have your website work a bit better in terms of uploading files and showing really long pages like modules page and blocks page in the admin section of drupal.

Create a php.ini file in your site's root folder and copy and paste this code into it.

register_globals = Off
memory_limit = 96M
post_max_size = 100M
upload_max_filesize = 100M
max_execution_time = 1000
max_input_time = 1000 

You can also check this link for more good info on how to fix server memory problems. http://drupal.org/node/76156