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Add note about VPN overhead to speedtest

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Fornax
2024-03-11 14:41:42 +01:00
parent 0c501a817a
commit 8d61e9d4cd
2 changed files with 25 additions and 7 deletions
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8
svelte/src/speedtest/Index.svelte
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@@ -75,6 +75,14 @@ import Speedtest from "./Speedtest.svelte";
This means that the data has to travel further and is more likely to This means that the data has to travel further and is more likely to
be throttled. be throttled.
</p> </p>
<p>
VPN services also add overhead to your connections, which lowers
effective download speed. VPNs using OpenVPN lower your download
speed by approximately 17.2%, and VPNs using the more modern
WireGuard protocol lower your download speed by approximately 4.5%.
To get most accurate results make sure you have any VPN services
turned off.
</p>
<h2>How do I read these results?</h2> <h2>How do I read these results?</h2>
<p> <p>
If the speed is a lot slower than your usual downloads it can mean If the speed is a lot slower than your usual downloads it can mean

24
svelte/src/speedtest/Speedtest.svelte
View File

@@ -83,11 +83,11 @@ const measure_speed = (stop, test_duration) => {
// Updates per second // Updates per second
const ups = (1000/update_interval) const ups = (1000/update_interval)
// This slice contains the speed measurements for three seconds of the test. // This slice contains the speed measurements for two seconds of the test.
// This value is averaged and if the average is higher than the previously // This value is averaged and if the average is higher than the previously
// calculated average then it is saved. The resulting speed is the highest // calculated average then it is saved. The resulting speed is the highest
// speed that was sustained for three seconds at any point in the test // speed that was sustained for two seconds at any point in the test
const hist = new Uint32Array(ups*3) const hist = new Uint32Array(ups*2)
let idx = 0 let idx = 0
// This var measures for how many ticks the max speed has not changed. When // This var measures for how many ticks the max speed has not changed. When
@@ -96,12 +96,19 @@ const measure_speed = (stop, test_duration) => {
let unchanged = 0 let unchanged = 0
const unchanged_limit = (test_duration/3)/update_interval const unchanged_limit = (test_duration/3)/update_interval
console.debug(
"Test duration", test_duration,
"interval", update_interval,
"unchanged_limit", unchanged_limit,
"history", hist.length,
)
// Variables used in the loop
let previous_transferred = 0 let previous_transferred = 0
const start = Date.now() const start = Date.now()
console.debug("Test duration", test_duration, "interval", update_interval, "history", hist.length) const measure = async () => {
let measure = async () => {
// Update the speed measurement // Update the speed measurement
hist[idx%hist.length] = data_received - previous_transferred hist[idx%hist.length] = data_received - previous_transferred
previous_transferred = data_received previous_transferred = data_received
@@ -145,7 +152,10 @@ const measure_speed = (stop, test_duration) => {
history.replaceState( history.replaceState(
undefined, undefined,
undefined, undefined,
"#s="+speed+"&l="+latency+"&t="+data_received+"&h="+encodeURIComponent(server), "#s="+Math.round(speed)+
"&l="+latency+
"&t="+data_received+
"&h="+encodeURIComponent(server),
) )
result_link = window.location.href result_link = window.location.href
} }