Here is the archive of articles from the old Aitoc’s blog (moved on April the 17, 2015).
Using APC to speed up Magento
Speed up Magento 2 times in 3 simple steps
Recommended Magento Server Configuration
Magento and PayPal Sandbox
Choosing the Right Type of Product in Magento
Goodbye to Aitoc Rewrites System
Breaking News: We Got Acquired! Meet Aitoc’s New CEO and See What’s in Store for You