this is a great tip actually, thanks hexixi

this is an interesting feature, why we must turn it off ?

when i turn off 3d touch may it saves battery ?

3D Touch, of course, offers shortcuts to commonly used app-specific actions right from the Home screen and lets you preview content or jump straight into it within supported apps by applying varying degrees of pressure to the screen.

People with disabilities, those with limited motor skills and everyone who would rather do without these handy shortcuts for one reason or another can easily disable 3D Touch on your iPhone 6s or iPhone 6s Plus.

How to disable 3D Touch on iPhone 6s and iPhone 6s Plus
Step 1: Launch Settings on your iPhone 6s or iPhone 6s Plus.

Step 2: Navigate to the General → Accessibility → 3D Touch section.

Step 3: Toggle the 3D Touch switch to the OFF position to disable the feature.
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And that’s it, your iPhone 6s or iPhone 6s Plus will no longer respond to how hard your finger is pressing the screen.

How to enable 3D Touch on iPhone 6s and iPhone 6s Plus
To re-enable 3D Touch at any point, just toggle the switch back to the ON position.

“When 3D Touch is on, you can press on the display using different degrees of pressure to reveal content previews, actions and contextual menus,” reads the feature’s description.

On the same screen, you can control the sensitivity of 3D Touch.
Guide from hcqs