Hi there! I understand you're having trouble logging into the Torchy's Tacos app on your iPhone, and you've noticed it's running really slowly. Let me help you get this sorted out.

To start, could you tell me if you see any error messages when trying to log in? Also, is the slowness happening only in the app, or with your whole phone or internet connection?

In the meantime, here’s a step-by-step guide you can try to resolve login and performance issues on your iPhone running iOS 18.7.1:

1. Close and Restart the App:
- Swipe up from the bottom of the screen and pause in the middle to open the app switcher.
- Swipe the Torchy's Tacos app off the screen to close it.
- Relaunch the app and try logging in again.

2. Check Internet Connection:
- Make sure your Wi-Fi or cellular data is working well.
- Try opening a webpage or another app that requires internet to confirm connectivity.

3. Clear App Cache (if applicable):
- iOS doesn’t let you clear cache directly for apps, but uninstalling and reinstalling the app will do this.
- Press and hold the app icon, tap ‘Remove App,’ then reinstall from the App Store.

4. Update the App:
- Open the App Store, tap your profile icon, and scroll to see if there’s an update available for the Torchy's Tacos app.
- If yes, update it.

5. Restart Your iPhone:
- Press and hold the side button and volume up (or down) button until the slider appears.
- Slide to power off, wait 30 seconds, and turn it back on.

6. Verify Apple ID and Password:
- Make sure you’re entering the correct login credentials.
- If needed, reset your password on the Torchy's login page.

If after these steps your login still fails or the app remains slow, it could be related to app-specific server issues or account problems. In that case, I can escalate this to the Torchy's tech support team for a closer look.

Does any of this sound like what you’ve tried so far? And if not, please let me know which steps you’ve already done, so I can suggest the next best action for you.