How to fix Composer's slowness

You may have notice that Composer can get really, reaally slow on some setups. This is the case at my office, so I tried to find a solution. Let’s run Composer in very verbose mode :

$ composer -vvv require phpunit/phpunit
Reading ./composer.json
Loading config file ./composer.json
Checking CA file /etc/ssl/certs/ca-certificates.crt
Writing /root/.composer/cache/repo/ into cache

And it seems to get stuck here. In fact, it’s not. If you wait for a little while (let’s say, 2 or 3 minutes), Composer stores the file in cache and downloads the next provider-*.json file. Which takes 3 more minutes and Composer won’t finish its downloads soon because, it will download more than 10 files after that.

But Google is great and it gave me the solution :

$ composer config --global repo.packagist composer

And now it runs fast. Just because sometimes, Packagist is slow through HTTP without SSL.

Please note : PHP must support SSL for this to work.

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