Is jailbreaking my iPhone safe?

I had a jailbroken 4th gen iPod Touch for 3 years, and I loved it. But after iOS 6 came and I jailbroke it again, it was super slow and glitchy. I'm not sure if this was because of the jailbreak, or my iPod was just getting old and out of date. I'm afraid if I jailbreak my iPhone, it will ruin it by slowing it down and making it glitchy like my old iPod Touch. Will it slow down, or can the A6 processor perform flawlessly with the jailbreak? I most likely will not be using it for themes.

It could mess up your phone sometimes, i had that too, i could use it but internet won't load then i tried it again and then my phone wouldn't startup X/

It could be a risk jailbreaking:/

It is safe. Your A6 chip is good enough. But if you customized your iPhone too much, then will became slightly laggy or keep switched back to 'safe mode'.

You'll end up voiding the warranty and insurance you need.

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