Erwin Hofman
as an event speaker

Organizing an event and want to cover e-commerce pagespeed, technical UX or Core Web Vitals?

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Fullname, role and company

My name, role and company is as following:

Name
Erwin Hofman
Role
web performance consultant @ ErwinHofman.com
co-founder + CTO @ RUMvision

LinkedIn (very active)
https://www.linkedin.com/in/erwinhofman/
Bluesky (passive)
https://bsky.app/profile/erwinhofman.bsky.social
Twitter (passive)
https://twitter.com/blue2blond

Bio

Short bio

Erwin Hofman moved from building his own fast CMS to helping e-commerce agencies and merchants with web performance optimization as a Google Developer Expert. He is also the co-founder of RUMvision, providing merchants with real-time, detailed Core Web Vitals insights.

Longer version

Started developing in 2001, Erwin gained performance knowledge and best practices via trial & error within his own agency and reading many (Google) docs.
At the end of the last decade, Erwin started sharing his learnings. Both during public events and privately with merchants & development + SEO agencies via audits & training sessions to help them saving trial & error hours and allowing them to improve decision making with performance in mind.
He shares best practices and (case) insights on regular basis via LinkedIn and co-founded a real monitoring solution (RUMvision).

Tools

Typical tools I use when doing my job are:

Webpagetest
Lab data (synthetic testing) of webpages to get a quick and broad idea of the state of performance and individual metrics.
Chrome DevTools
I revert to Chrome DevTools for the questions that Webpagetest can't answer. For example, I use it to run performance snippets I've created or collected over time.
free CrUX
Free historic CrUX API helps getting insights per URL over the last 6 months, returning data per week to see recent changes. I use the free RUMvision tool to automatically visualize that data. It also shows a navigation type breakdown, allowing me to draw initial conclusions.
This data is not real-time, cannot be filtered and no conclusions regarding causes and bottlenecks can be drawn. That's where a detailed RUM comes in:
RUMvision
A snippet to be installed to get real-time actionable insights into user experiences (field data).
This helps me understand device and connectivity conditions and divide my work into tailored priorities (which will come with the biggest wins).
Disclaimer: I co-created this SaaS for this exact purpose.
BuiltWith
By checking the history of technology changes of a webshop and combining this with Treo.sh data, I might already be able to tell what caused visible improvements (or regressions).