Hi Lisa,
Thank you for posting your concern's here.
I would suggest doing the following solutions given below.
If you are using a modem and connected to your Wifi, restarting your modem is the quickest and easiest first thing to do, but note that resetting your modem is different from restarting, just press the power button at the back of your modem and wait for couple of seconds then turn it on again. Also, you may unplug your modem and plug it in again.
If you are connected and using your Wifi make sure that there's no other device that is connected, having a lot of devices connected to one internet source will slow down your internet speed.
- Clear your browsing history
Go to the Settings of your Safari app, please tap the icon, scroll down and then tap the "Clear History" button. Repeat this on a regular basis to keep your browsing fast.
I hope this helps!
If you have any other questions, please comment down below.
Have a great day!
Best Regards,
Christian