My iPhone X feels slower after updating to 12.1

Yeah, heard of this but thankfully never experienced it for myself yet. So far all my OTA updates have been good
My X is at 97% capacity. On the fence to change it or not...

iPhone X Display Module Replacement Program for Touch Issues

iPhone X

Apple has determined that some iPhone X displays may experience touch issues due to a component that might fail on the display module. An affected device may exhibit the following:

1. The display, or part of the display, does not respond or responds intermittently to touch

2. The display reacts even though it was not touched

Apple or an Apple Authorized Service Provider will replace the display module on eligible devices, free of charge.

No other iPhone models are part of this program.

Service process

Find an Apple Authorized Service Provider to have your iPhone X serviced. Your iPhone will be examined prior to any service to verify that it is eligible for this program.

If you have questions or need further assistance, please contact Apple Support.

Before service, backup your iPhone to iTunes or iCloud. Learn more about preparing your iPhone for service.

If your iPhone X has any damage which impairs the ability to complete the repair, such as a cracked screen, that issue will need to be resolved prior to the service. In some cases, there may be a cost associated with the additional repair.

Additional Information

Apple may restrict or limit repair to the original country or region of purchase.

This Apple program doesn't extend the standard warranty coverage of the iPhone X.

If you believe your iPhone X was affected by this issue, and you paid to replace your display module, you can contact Apple about a refund.

The program covers affected iPhone X devices for 3 years after the first retail sale of the unit.

I think is the safari an issue, try to do in Google Chrome.