code.org/en-US speed test — 20 Oct 2026

Measured from the wfix.shop server on 20 October 2026 at 13:36 UTC. Grade C (79/100), with the screenshots, the timings and the fixes that matter.

https://code.org/en-US

20 October 2026 at 13:36 UTC · Free test · report pt_1a632d42e621

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Grade

79/100

Performance79/100

Structure80/100

12 audit(s) passed, 4 need work

First byte (TTFB)218 msmeasured from this server

Fully loaded1.70 sfirst byte + slowest asset

Requests26document + assets

Page weight3.23 MBcompressed transfer

HTML document113.0 KBgzip

ProtocolHTTP/3CloudFront

Where the first byte went

DNS lookup 82 ms 38%
TCP connect 28 ms 13%
Server wait 107 ms 49%

Measured on the connection that fetched the HTML. Every other request on the page waits for the end of this bar before it can start.

How this page compares

First bytefaster than 90% of 4,999 pages tested here218 ms against a median of 449 ms

Page weightheavier than 89% of 4,999 pages tested here3.23 MB against a median of 650.3 KB

Fully loadedfaster than 58% of 4,999 pages tested here1.70 s against a median of 1.84 s

Requestssends more requests than 100% of 4,999 pages tested here26 against a median of 26

Every report published here is in this comparison, so it is a reference population of pages tested from one server - not a benchmark of the whole web.

What these numbers mean

The first byte arrived in 218 ms. That is workable, and the cheapest win left is caching or a warmer connection.
The page transfers 3.23 MB over 26 request(s). Html files are 97% of it, so that one type is worth a look on its own.
The HTML itself arrives gzip-compressed.
It runs over HTTP/3, so the assets share a connection instead of opening one each.
The largest element painted at 1.08 s, inside the 2.5 s Google calls good.
Layout stayed still (CLS 0.003), so nothing jumps under the reader's cursor.
The main thread was blocked for 198 ms in total, which is not enough to feel.

Fix first: Render-blocking resources - Add defer or async to scripts that do not change the first paint, inline the critical CSS, and load the rest with media="print" plus an onload swap.

Read on one shared server, not a visitor's phone: use it to compare pages against each other, not as a promise about every connection. We fix what these tests find.

Screenshot

What the page looks like

Loaded in headless Chromium on this server. Click an image to open it full size.

Mobile screenshot of code.org — **Mobile** 390 × 844 · 140.7 KB · page is 6000 px tall

Browser render

The same URL loaded in a real browser, so these are the readings curl cannot produce. The grade above is still built from the server measurements.

Largest contentful paint1.08 sgood is under 2.5 s

Cumulative layout shift0.003under 0.1 is stable

Total blocking time198 mslong tasks during load

First contentful paint928 msfirst content on screen

Browser page weight3.94 MB136 request(s), scripts included

Failed requests2blocked or unreachable

Largest contentful paint1.08 s

Goodgood under 2.5 s, poor over 4 s

Cumulative layout shift0.003

Goodgood under 0.1, poor over 0.25

Total blocking time198 ms

Goodgood under 200 ms, poor over 600 ms

Page weight by type

What the page is made of

Html 25 requests

3.12 MB 97%

Transfer size, compressed as sent. 26 request(s) in total, 3.23 MB across all of them.

Top issues

Render-blocking resources

high impact

37 render-blocking resource(s) in the document head (1 script(s), 36 stylesheet(s)). The page cannot paint until each one arrives.

Fix: Add defer or async to scripts that do not change the first paint, inline the critical CSS, and load the rest with media="print" plus an onload swap.

Total page weight

high impact

The page transfers 3.23 MB across 26 request(s), with the document itself at 113.0 KB.

Fix: Work through the heaviest assets first: images, then fonts, then third-party scripts.

HTML document size

medium impact

The document transfers 113.0 KB. A bloated document delays every other request, because nothing else can start until it is parsed.

Fix: Paginate long listings, move repeated markup into a template, and stop inlining large data URIs into the HTML.

Avoid extra redirects

medium impact

1 redirect hop(s) before the page load started, each one a full round trip before the first byte.

Fix: Link to the canonical URL (and make sure http, the apex domain and www all point at it) so no visitor pays a redirect first.