In php.ini there's this line zend_extension = "C:\xampp\php\ext\php_eaccelerator_ts.dll" and following this guide at XAMPP on Win7 too slow it says uncommenting that line makes XAMPP faster, but what's the point if the file wasn't even installed with latest Windows XAMPP installer.
So I snatched the file from Google and put in the dir, but now when starting servers Apache and the rest it gives this error: http://i.stack.imgur.com/ajQmg.jpg (not enough rep to post pics yet).
You should download and use one of the complied dll's below. It should match your PHP version.
PHP 5.3.XX VC9: http://eac.qme.nl/eAccelerator_v1_0_GIT42067ac7e2_for_v5_3_XX-VC9.zip
PHP 5.4.XX VC9: http://eac.qme.nl/eAccelerator_v1_0_GIT42067ac7e2_for_v5_4_XX-VC9.zip
Do not forget to rename downloaded file to: php_eaccelerator_ts.dll
来源：https://stackoverflow.com/questions/27566822/xampp-missing-php-eaccelerator-ts-dll