Website
Paste a site. Free report. Sign in to check a fix, find the file, or get a smaller image.
pafcore.site
Free full report, no signup
Find what is slowing your website.
Find what is slowing your website.
Down to the file. What to fix first.
Paste your website address. Free speed score, the slow file, and what to fix first.
Do not wait here. Keep this link.
Opens the report whenever it is ready, on any device. Nothing to sign up for.
Or email the report when it is ready
One email when it finishes, nothing else. Gmail may file the first one under Promotions.
2in the queue
You are second in line.
PafCore runs one scan at a time. Each one loads the page three times in a real browser, which one measuring server cannot do twice at once while this is the free public tier.
You do not have to wait here. Add your email under the link above, or copy that link and close the tab.
Starting
- Asking the server to start
- Loading the page, first run
- Loading it again, to see what moves
- Third run, then working out the causes
You can close this tab. The link above brings you back.
Your report
on a phone
Score looks too high? Check Lighthouse is set to Mobile. Desktop can be thirty points higher on the same page.
Start here
Send this to your developer, or copy the fix prompt into any coding agent.
Where you lost points
These overlap. Don't add them up.
What to try
Also worth a look
Optional next steps need credits
Everything above is free. Sign in does not add credits. Buy a pack only if you want find the file, a lab check, or paste ready code on a finding.
Credits are paid: $5 for 20. Pro Watch is separate at $19/mo.
Quick question
Did it pick the right problem?
If it got your page wrong, say so. That helps more than a yes.
The full report, as the terminal prints it
Public reports
Sites people checked.
Open any report. Same free answer you get when you paste a site.
No public reports yet. Be the first.
One report per site. Anyone with the link can open it.
The problem
Most speed reports list things that do not raise your score.
You open a long list. Almost none of it adds to the score. Nothing says which items would actually help.
5 of 49
Items in a typical speed report that add to the score. The other 44 are tips. Nothing says which tip would move one of the five.
0 of 25
What one real site already scored on the part its whole image fix list pointed at. Doing all of those fixes would have earned almost nothing.
9
Points between two checks of the same untouched website. Bigger than many real fixes are worth, which makes one score hard to trust.
The same website, twice, nothing changed in between
measured, not an example
run one
60
run two
51
9 points apart
Same website. Ran it twice. Changed nothing. Still nine points apart. One score on its own is not enough.
Only five things add to the score.
Extra script, blocked images, big files. All useful to clean up. On their own they add zero to the score. They only help if fixing one speeds up one of the five that count, and most reports never draw that line.
Every square is one item in a speed report. The amber ones are the only ones that add marks.
5 scored · 44 not
And a slow site gains almost nothing for getting a bit faster.
The scale bends. Going from 7.3 seconds to 6 seconds feels better for visitors, and it is worth about two points. You can work all afternoon and watch the score barely move.
Marks out of 25 for how long the biggest thing takes to show.
22.5 marks at 2.5s · 1.3 marks at 7.3s
What you get
Four steps.
The free check on this page does the first three. Lab proof and ready files are available with credits when a finding supports them.
01
Find it
What is slow, and which file is causing it.
02
Order it
What to change first, and how many points it might earn.
03
Check it
Check again after you change something. Did the score really move?
04
Say so
It worked, it did not, or we cannot tell yet. The numbers sit behind that call.
Ways to use it
Use it your way.
Same engine. Website for everyone. Terminal and Cursor for developers. API when you wire your own tools.
Terminal
Full report from our servers. Sign in, scan, then see if a suggested change would help.
pafcore login
pafcore scan https://yoursite.com
pafcore test 1Cursor or Claude
MCP tools so an agent can scan, check a fix, and find the file.
pafcore mcp installAPI
Same routes the site and CLI use. Session header. Curl ready.
POST /v1/scans
GET /v1/findings/:id/:nNeed score and noise only on your own machine, with no file names?
That is a different free tool: npx @pafcore/cli scan.
See measure only CLI.
The tools that already exist
All three are good. None of them close this gap.
Not a pitch against them. I use all three. Here is what each does well, and what it still leaves you with.
Lighthouse
Opens your website in a real browser and gives it a score. It has got better, and it can name files. It will tell you which image is too big.
What it leaves you It grades one run. Run it again and the number changes, and it will not say whether that change means anything.
PageSpeed Insights
Lighthouse on Google machines, plus real visitor data from Chrome. The visitor half is the part worth having, because search cares about it.
What it leaves you That half takes weeks to show a change you ship. Neither half tells you if this morning's fix beat the score moving by itself.
AI coding tools
Good at writing the fix. Point one at a report and it can shrink an image or split a big script. Faster than doing it by hand.
What it leaves you It reads the same report, so it picks the biggest number rather than the one you can win, and it checks its work by running once.
Questions
The usual questions.
Is this just Lighthouse with a nicer look?
It uses Lighthouse for the lab numbers, so the raw scores match. Two things are different. Lighthouse grades one run and stops. PafCore loads the page three times and shows how far the score moves on its own, so you can tell a real gain from a lucky run. It also finds the file behind the slow part, then orders fixes by how many points they might earn.
If you only need a grade, Lighthouse is free and already on your computer. Use it.
Can I paste the report into Cursor and let it fix things?
For the fix itself, often yes, and faster than you would. The hard part is choosing what to fix. The tool reads the same report you do, so it picks whatever number looks worst, not whatever you can win, and it checks its work by running the test once more.
One more run cannot tell a real gain from the score moving by itself. Measuring that move is where this starts.
What will it cost?
The full report on this page is free for public websites. Three free reports a day. After that, another report costs 1 credit when you are signed in. Fair use still stops one site soaking the scanner.
Sign in does not add credits. Buy a pack for the next steps: see if a suggested change would help, find the file, download a smaller image, or get code to paste. A pack is $5 for 20 credits. Credits also buy another full report after your free daily limit. Pro Watch ($19/mo) is separate: schedules, history, alerts, and 60 credits each month.
When can I use it?
Now, at the top of this page. Paste a website address and you get the real report: the score, how far it moves on its own, the file behind the slowest thing, and what to fix first.
Same engine also runs from the terminal, Cursor or Claude (MCP), and the HTTP API. See Ways to use it and the docs.
There is a separate free command for score and movement only on your machine. It does not name the slow file the way this page does. Details: measure only CLI.
Can I use it from Cursor or the terminal?
Does it work on any site?
Anything a browser can open without signing in, to start with. Sites behind a login, and anything slow only after a click, are harder and come later.
It will not work on everything. When it cannot measure something, it says so rather than guessing.
Who builds it?
A small product, shipped in the open. Decisions and progress are posted on X. Security and product mail: hello@pafcore.site.
Scoring guide
Get the scoring guide.
How the speed score is really worked out. Not three sentences and not only the source code. Read it here, or leave an address and we will send it plus a note when something new ships.