Evad3rs developers team has updated their jailbreak tool evasi0n to evasi0n 1.5 which includes improvement for boot-up time and also have added an updated Cydia package list.
You can download Evasi0n 1.5 for Windows, Mac or Linux via evasi0n web page.
iOS 6.1.2 Update for iPhone, iPod Touch and iPad
How to Jailbreak iPad Mini, iPad 4, iPad 3 over iOS 6.1 with Evasi0n
How to Jailbreak iPod Touch 5G, 4G over iOS 6.1 with Evasi0n
How to Jailbreak iPhone 5, 4S, 4, 3GS over iOS 6.1 with Evasi0n