Member-only story
Weekly Digest #88
3 min readAug 15, 2022
Articles
How to select a device configuration for site speed tests
- Network Latency — how long does a network round trip between browser and server take?
- Network Bandwidth — how much data can be transferred per second?
- CPU Throttling — is the processor slowed down to simulate a mobile device?
- Test Location — where in the world is the test run from?
- Screen size — are you testing the mobile site or the desktop site?
Testing with a low-end device is a good way to identify potential performance optimizations.
It’s difficult to get lab metrics to match Core Web Vitals field data, but picking settings that are a bit worse than what’s typical for your users usually gets you close enough.
How can you be fooled by the U+202E trick?
A common technique, used by malicious attackers to fool their victims, is using the Unicode special character U+202E known as an annulment from right to left to make the malicious file appears as a PDF document instead of a potentially dangerous executable file.
make documentfdp.exe appear to be documentexe.pdf
