Here’s a tip from Brad Ney about how to speed up WordPress load times using web server compression:
First of all, upload a test file like “test.php” on your web server. This file must contain this line:
<?php phpinfo(); ?>
View this file with a web browser and check if “zlib” is enabled by your hosting provider.
It it’s ok, place the following code in your header (above the DOCTYPE):
<?php
ini_set('zlib.output_compression', 'On');
ini_set('zlib.output_compression_level', '1');
?>
That’s all! Test if everything is working correctly.
Another way, probably safer than this one, is to use Wp Super Cache plugin and enable “Super Cache Compression” in its control panel.
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