Issues with redirect()

[eluser]reepher[/eluser]
"This is more of a PSA in the hope that anybody with the same issue doesn't waste half a day like I did"

I recently had an issue that prevented any function using redirect() to work correctly. I would only get a blank page. No errors in Apache, PHP, codeigniter ... just a blank page. I chased down the usual suspects: proper setting in the config file, whitespace, server time, cookies set properly and yielded nothing. I finally figured out that pagespeed had been loaded. Disabling this chunk of junk fixed the issue.