While IE9 was available in both 32-bit and 64-bit editions, the 32-bit version was the default and generally recommended choice due to its superior performance at the time.
: A long-awaited feature that included a security-enabled manager with the ability to pause and resume transfers. Internet Explorer 9 (32 bits)
: The 32-bit version featured the new "Chakra" JavaScript engine. It utilized a background thread for Just-In-Time (JIT) compilation , allowing users to interact with pages while the browser generated faster code in the background. While IE9 was available in both 32-bit and