Paweł Pokrywka's Lab

15 ways your website loads from Google Search and how to measure each one

How to improve page load time for Google visitors using Signed Exchanges (part 7 of 10)

Sep 3

April 2025

Stretching Google's prefetching

Making Chrome play a 19 MB video while "offline"

Apr 9

March 2025

Other causes of Signed Exchanges errors

From various limits to global outages—how to tackle SXG challenges (part 6 of 10)

Mar 3

1

February 2025

Debugging mutable subresources: a detective story

The bizarre case of Signed Exchanges: how frequent deployments increased the error rate and revealed hidden cache poisoning (part 5 of 10)

Feb 21

The mystery of mutable subresources in Signed Exchanges

What they are, how they break caching, and how to fix them (part 4 of 10)

Feb 11

1

January 2025

Understanding CORS errors in Signed Exchanges

Learn debugging techniques and why the all-or-nothing principle makes these errors critical (part 3 of 10)

Jan 31

Prefetching subresources with Signed Exchanges

How to make your website load instantly for Google-referred users (part 2 of 10)

Jan 13

2

2

How I brought LCP down to under 350 ms for Google-referred users on my website

Exploring the techniques I used to optimize performance on a high-traffic website

Jan 8

8

2

August 2023

Create a Ruby gem with Zeitwerk as a development-only dependency (tutorial)

Forget require statements and make your gem lightweight at the same time

Aug 20, 2023

July 2023

Rebooting Linux with encrypted disk

How to make it easier to keep the kernel updated

Jul 31, 2023

Ledger card: was there a data leak?

How I traced the source of the potential data leak

Jul 4, 2023

2

August 2021

How to deanonymize smart contract author

Doxxing Solidity developer for fun and profit

Aug 7, 2021

1