If you’re already running Linux Mint 14, you don’t need to reinstall.
The new ISO images provide fixes for the following issues:
High CPU usage, low performance on Intel GPU
This was caused by a race condition between Plymouth and Xorg and affected owners of Intel cards in particular. Rather than using the “intel” driver, Xorg was randomly using “modesetting” or “fbdev” and the desktop was rendered by the CPU rather than the GPU using LLVMPIPE software rendering.
This issue was fixed in MDM 1.0.8 which is available as an update in Maya backports and in Nadia and which is installed by default on the new ISOs.
No DNS resolution, Internet not working in virtual machine
Linux Mint now uses OpenDNS as a fallback for DNS resolution. If the system fails to connect to a DNS server, the resolution is done via OpenDNS. This guarantees better out of the box connectivity especially in virtual machines.
Installer fails to install grub-efi
A bug was fixed and the installer now successfully installs the grub-efi packages in EFI installations. You still need to disable Secure Boot and depending on the implementation of EFI on your system you might have to specify the location of the EFI boot file (EFI/BOOT/grubx64.efi).