Hello!
I have the same issue as fesarlis. I have WordPress v4.1 behind a firewall that will not allow outgoing HTTP. I have installed the Disable All WordPress Updates v1.4.3 and it seemed to have improved the speed of the admin interface, but it is still a little slow. I have installed Snitch and here are the results of me clicking around on a couple of pages in the admin interface:
https://docs.google.com/spreadsheets/d/1iYtTcFdjzHyS2Hs33aPDH-lGQ9CZRpUlpE7WV7Ig4_I/edit?usp=sharing
Before installing your plugin, Apache was giving out 2 errors per page load:
[Fri Feb 06 10:28:10 2015] [error] [client 192.168.100.10] PHP Warning: An unexpected error occurred. Something may be wrong with www.ads-software.com or this server’s configuration. If you continue to have problems, please try the support forums. (WordPress could not establish a secure connection to www.ads-software.com. Please contact your server administrator.) in /app01/local/wordpress/wp-includes/update.php on line 295, referer: https://app07.ottawa.ca/blogs/wp-admin/network/plugins.php?deleted=true&plugin_status=all&paged=1&s=
[Fri Feb 06 10:28:16 2015] [error] [client 192.168.100.10] PHP Warning: An unexpected error occurred. Something may be wrong with www.ads-software.com or this server’s configuration. If you continue to have problems, please try the support forums. (WordPress could not establish a secure connection to www.ads-software.com. Please contact your server administrator.) in /app01/local/wordpress/wp-includes/update.php on line 457, referer: https://app07.ottawa.ca/blogs/wp-admin/network/plugins.php?deleted=true&plugin_status=all&paged=1&s=
Now, after installing your plugin, I only get one error per page load (looks like it fixed the line 295 error):
[Fri Feb 06 10:28:53 2015] [error] [client 192.168.100.10] PHP Warning: An unexpected error occurred. Something may be wrong with www.ads-software.com or this server’s configuration. If you continue to have problems, please try the support forums. (WordPress could not establish a secure connection to www.ads-software.com. Please contact your server administrator.) in /app01/local/wordpress/wp-includes/update.php on line 457, referer: https://app07.ottawa.ca/blogs/wp-admin/network/plugins.php?activate=true&plugin_status=all&paged=1&s=