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9 votes
Accepted

How Do USB 3.0 Hubs And USB Extension Cables Effect Latency, If At All?

I know plugging the 2.0 devices into a 3.0 extension won't take any advantage of 3.0 speeds. But what if they're all connected to a 3.0 hub, connected to a 3.0 cable? Would that cause those 2.0 ...
fixer1234's user avatar
  • 27.5k
6 votes

Why does Windows not need a low latency or real time kernel?

Neither Windows nor Linux is anything close to a real-time operating system (RTOS) and as far as I know, neither can be made to be so. The goals, requirements, and philosophies of RTOS versus general-...
Glenn Slayden's user avatar
5 votes

Where does internet latency comes from?

There are a few things going on here – the main one is your figure for the speed of light is off by 3 orders of magnitude – the figure you quoted is meters per second, not km/second. The second ...
davidgo's user avatar
  • 71.1k
5 votes

How to reduce latency with openssh?

You can take advantage of a tool like Mosh From Mosh site: Remote terminal application that allows roaming, supports intermittent connectivity, and provides intelligent local echo and line editing ...
Matías's user avatar
  • 241
4 votes
Accepted

Which RAM should I prefer (CL vs PC)?

The "PC" number is a DDR module name, it indicates module's data rate. PC4-17000 modules have 2133 MHz data rate (2133 × 8 ≈ 17000) PC4-19200 modules have 2400 MHz data rate (2400 × ...
gronostaj's user avatar
  • 57.2k
4 votes

How to fight network latency and jitter issues on Wifi?

The root cause of jitter and latency on a WIFI network is a combination of available bandwidth, number of people using the connection and interference - thus to improve latency you need to improve ...
davidgo's user avatar
  • 71.1k
4 votes
Accepted

My WIFI connection has high ping periodically

This could be any one of a number of things. The most likely is that you are simply in a noisy (to WIFI frequencies) environment, but it could also be an issue with the card in your PC and/or its ...
davidgo's user avatar
  • 71.1k
4 votes
Accepted

What causes periodically high latency on a network?

Hmm, Seems like your wireless signals are getting affected. You can check for the following things:- Whether there is any interference, check for any radio waves transmitting device. Be it a ...
Anirudh Malhotra's user avatar
4 votes
Accepted

Is dividing latency by frequency an accurate way to compare RAM

Here's an interesting blog post that explores the latency vs speed question: http://www.crucial.com/usa/en/memory-performance-speed-latency. This article's conclusion: Which is more important: speed ...
skrrgwasme's user avatar
3 votes

Wifi Latency : modem or internet carrier?

The first thing I would check is whether the performance improves by using an ethernet cable directly into your router. That way you can rule out the connection to your property being at fault. If ...
Randomhero's user avatar
  • 1,402
3 votes
Accepted

What might be causing periodic audio pops and crackles in certain Windows 10 applications?

After nearly 18 months of accepting persistent audio crackling issues as the norm, I found the culprit earlier this evening. Corsair's iCue peripheral management software I committed to a clean ...
Steve Guidi's user avatar
3 votes

High latency when browsing web but dramatically reduces when using VPN

maybe the DNS you are using, when not on VPN, is slow. How did you measure your latency? one quick way to test it is to ping a URL and then its equivalent IP address like: ping google.com ping 172.217....
Demetri A. Mkobaranov's user avatar
3 votes

Is this keyboard latency test accurate for both PS/2 and USB keyboards? How can I test the latencies of keyboards?

While the test can measure the polling rate, it cannot tell if there is a delay in the pipeline, i.e., due to a fixed delay between the time contact is made and the signal reaches the PC. You'd need a ...
DrMoishe Pippik's user avatar
2 votes

Many Transition from drive PhyRdy to PhyNRdy causing latencies in Windows 7?

This counter in itself is pretty inconclusive, SATA specs are paywalled, but the publicly-available errata define it as: Identifier 009h The counter with identifier 009h returns the number of ...
kRush's user avatar
  • 446
2 votes

How to reduce latency on FFmpeg video streaming?

Add the option ffmpeg with -tune zerolatency and best option using x265 codec, reduce VideoSize 640x480 to VideoSize 320x240. Lastly, change your player from vlc to ffplay
binaryCode's user avatar
2 votes

Low latency keyboards - are they for real?

There is some in-depth analysis of latency when typing into an editor. See Typing with pleasure, 2.1 Input latency. There is some latency from the keyboard scanning, some from USB, but then also other ...
David Roussel's user avatar
2 votes
Accepted

Huge latency in the middle of a route between India and Europe

The distance from India to France is in the order of 7000km's, which means a return trip time of about 120ms just on that leg - and I imagine that, reverse DNS notwithstanding, hop 7-8 is the backhaul ...
davidgo's user avatar
  • 71.1k
2 votes

Why does enabling WMM on a WiFi router cause increase in latency?

The culprit may be Power Save Certification. From Wikipedia : The underlying concept of WMM PowerSave is that the station (STA) triggers the release of buffered data from the access point (AP) by ...
floxOne's user avatar
  • 175
2 votes

Why is DDR4 latency so much higher on AMD CPUs than on Intel CPUs? How is performance affected?

Ratio of latencies is not ratio of speeds, e.g. having half latency does not mean having double speed. It has a few percent affection on speed. Given that we are comparing same types of memory (e.g. ...
Bahram Alinezhad's user avatar
2 votes

High ping with Ubuntu 17.10 host

I have the same problem. I found a response here Basically, it is caused by the power management features. After disable it, the latency improves a lot. sudo iwconfig wlan0 power off
nhnghia's user avatar
  • 121
2 votes
Accepted

Latency of SSDs versus HDDs

The latencies of an SSD vary hugely, but in terms of IOPs (which us probably the term you want to google)you are looking at an increase in the order of 2-5 magnitudes. (Ie 100 iops for HDD, starting ...
davidgo's user avatar
  • 71.1k
2 votes

Run a tracert continually for period of time

A quick solution would be to use a self-calling batch script which displays the date and time before doing a tracert For example @echo off echo Doing tracert at %date%, %time% >> pinger.txt ...
daddy7860's user avatar
  • 181
2 votes
Accepted

Is memory latency still a key factor in computer speed?

It depends. Part of me wants to quote Spiderman and answer your question Is memory latency still a key factor in computer speed? with It never was. But that would be dismissing a small sub class ...
Mokubai's user avatar
  • 93.1k
2 votes
Accepted

Ping too low between Europe and US

There are indeed IP adresses, who have geo-specific routing: The trick is that the BGP announcements are by design not consistent around the globe, creating non-unique IP adresses without trashing ...
Eugen Rieck's user avatar
  • 20.3k
2 votes
Accepted

Mikrotik Hotspot Performance Degradation: So Slow Hotspot Unusable

Mikrotik's automated Hotspot "wizard" created the fault: it inserts its rules ABOVE the one allowing related,established connections in the FORWARD chain. RESOLUTION: Moving the related,established ...
F1Linux's user avatar
  • 373
2 votes
Accepted

If you run fast RAM at a slower clock speed, will the latency timings improve?

In general, yes... If the memory reports it is capable that, and most reputable RAM does. Looking in the BIOS should tell you what the RAM timings are in most cases. To see the memory timings in Linux,...
acejavelin's user avatar
  • 6,548
2 votes
Accepted

Why using a GPS usb stick increases the latency of my WiFi connection?

There is nothing inherent to GPS that should cause an increase in Wi-Fi latency. You will have to troubleshoot this like any other "the presence of one peripheral slows down my other peripheral&...
Spiff's user avatar
  • 105k
2 votes
Accepted

How to specify TCP congestion algorithm to use for my long running rsync process?

If the destination is known, specify the congestion control algorithm as a route option: ip route add <ip_addr>/32 via <gateway> congctl lp Alternatively, LD_PRELOAD a library that calls ...
grawity_u1686's user avatar
1 vote

Insanely high latency when full bandwidth is in use

High latency when the link is saturated is the telltale sign of a widespread router/modem design flaw known as bufferbloat. Run http://dslreports.com/speedtest (if it supports your country) from a ...
Spiff's user avatar
  • 105k

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