Hi Eva
Unless there is a fundamental flaw with your device, upgrading to 7.1.1, the latest version, actually adds some stability improvements and fixes some less optimum settings that were present in 7.0.x so in the grand scheme of things, your device should technically perform better with 7.1.1 installed.
I know what you mean, as more of my favourite tweaks are being included in successive iOS releases, the need for me to jailbreak is becoming less over time. I doubt that when iOS 8 rolls out I will even bother with a jailbreak anymore.