Jailbroken 3G phone: progressive app slowdowns and worsening battery life

in iPhone edited January 2014
I have a jailbroken (via Pwnage.app) iPhone 3G. I jail broke it shortly after I got it (several months ago).

I am currently experiencing the following problems which seem to be getting worse:

[1] Battery life: with moderate 3G Internet/email usage within 30 minutes charge will be down 2/3 to 1/2.

[2] Sluggish apps: Safari, Mail, etc are taking a couple of seconds to launch after icon touched. Also frequently when typing there will be a 1-2 second delay between key presses and when the letter finally registers.

I have a handful of Cydia and AppStore apps on the phone.

Can anyone comment if this problem might be due to the jailbroken OS and/or jailbroken apps not utilizing memory/power management correctly, or is it more likely a hardware issue (particularity in the case of the battery life)?

Obviously, one way to find out is to do a restore to the native OS and see if things improve. But I thought I'd ask here to get some thoughts before going down that road...

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