Our team has just published the Beta 2 version of PrestaShop 1.4, implementing lots of optimizations:
- Loyalty module has been optimized,
- Guest Checkout has been improved,
- Tax system is now more efficient,
- New features have been added to UPS and USPS modules,
- Paypal and MoneyBookers modules have been optimized.
The complete list of optimizations is available in CHANGELOG. Please note that this version is a Beta, and that you should only use it for tests.