my iphone 7 plus has been working so slow and continues asking me for the apple ID password

For Problems With Your Apple ID

1. Forgot iCloud Password
2. Forgot Apple ID
3. iForgot Password - Apple ID
4. iForgot UserName - Apple ID
5. Apple ID - Apple Support
6. Manage your Apple ID primary, rescue, alternate, and notification email addresses
7. About your Apple ID email addresses
8. Get help with Apple ID
9. Contact Apple for help with Apple ID account security - Apple Support
10. What to do after you change your Apple ID email address or password - Apple Support

Reset Security Questions

Contact Apple for help with Apple ID account security

You may need to reach Apple’s Account Security department. If you cannot find your country or are not able to call, then complete this form and send it to them.

You need an Apple ID and password to use the device because Find My Phone is activated.

Activation Lock Problem

If you purchased the device second-hand, then it is useless without the Apple ID and password to which it is locked. If you don't have it and cannot get it, then the device is useless to you. Return it for a refund, if you can, or take it to an Apple store for an exchange provided they will help you. If you are the original owner then take the device, a copy of your purchase receipt and identity proof to an Apple retailer where they may be able to assist you.

Find My iPhone Activation Lock

If you can't activate your iPhone - Apple Support