For questions concerning computer, or computer-related, performance. Please include metrics in your questions.

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0
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51 views

OpenGL rendering affects CPU

I have a problem with an app that is slowed down significantly when an openFrameworks based app is launched. Both apps use little cpu and memory, so i don't think there's a bottleneck. I can ...
0
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1answer
42 views

very slow internet connection

I have a netgear router and the internet strength says its excellent but when i try to play online on my xbox it is very slow and only have one bar connection. And i have noticed that when it goes ...
0
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0answers
38 views

what is the number of operations per cycle for the cortex a57 arm processor?

Im trying to figure out how many double precision operations per cylce a cortex A57 processor can achieve, according to this manual page, there can be upto three instructions per cycle delivered ...
2
votes
2answers
138 views

Does cable length factor in on component performance? [closed]

This is completely hypothetical, and just something I've been curious about. I remember Grace Hopper on Letterman talking about correlating lengths of wire to nano seconds (a certain length of wire ...
73
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10answers
11k views

Are computers with more RAM potentially faster if not all memory is usually in use?

Let's say I have a computer with 16 GB of memory. If my computer is usually only using about 4 GB and never reaches 8 GB, is it any faster than a computer with only 8 GB of (the same type of) memory? ...
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0answers
203 views

How to improve the wifi performance of openwrt

If my computer download through my tplink router, the speed is 10Mbps, if through openwrt router, it's 5Mbps. Here is wifi information: root@localhost:/etc/config# iwconfig wlan0 wlan0 IEEE 802.11bg ...
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0answers
143 views

Sluggish Flash/HTML5 in Firefox 30.0

There are websites that have video playing back in the backround and removethebackground.com is one of those sites. This kind of effect slows browser's response almost to a crawl unless I switch to ...
1
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0answers
113 views

Linux: What is causing high interrupt activity for IRQ 23 (ehci_hcd)?

I run gkrellm to monitor my workstation. Total CPU usage usually runs 0-1% at idle; when there is activity, it's usually cyan-colored (user space). It was running clean this morning. A couple hours ...
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0answers
59 views

Obligatory reset after booting windows, afterwards periodical slowdowns apparent

Whenever I first boot up my PC it needs a hard reset, as it becomes unresponsive immediately after finishing loading Windows (the point where you'd expect to begin working). After this initial reboot, ...
2
votes
1answer
176 views

Inkscape very slow to start up on Windows

I've noticed lately on my Windows 7 x64 PC that Inkscape (v0.48.4) is very slow to startup. Once the window becomes visible it will display "Not responding" in the title bar for a minute or two. Once ...
0
votes
1answer
43 views

Understanding RAM vs CPU for basic tasks

I recently purchased a very cheap Android tablet; however, my question is actually device agnostic and my question applies to desktop PC's/laptops too. It had 1GB RAM and 1.2 GHZ processor. It ...
0
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0answers
16 views

Making windowed performance same as full-screen?

As you all well know, running software (let's say some demanding game) in a windowed mode drastically reduces the performance of the application (framerate), presumably because of the desktop, ...
1
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2answers
110 views

Any realistic advantage of 802.11ac over 802.11n for a regular home connection?

I am using a 802.11ac Asus - 802.11ac Dual-Band Gigabit Wireless router. Don't have any complains yet but does it really matter to go from a $90 802.11n router to $200 802.11ac router? In theory, max ...
0
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0answers
155 views

Why does my PC slow down to a crawl when VMware and ntoskrnl.exe is writing to a data drive?

My PC becomes almost unusable when writing to my data drive. The main suspect which exhibits this issue is VMware Player. The problem does not happen when I myself move files in Windows Explorer or do ...
1
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3answers
101 views

Available physical memory, XP

I installed a Windows XP x86 on my PC. But when I open the system information window in the System Summary tab, in the right-hand pane and at bottom the following are written: Total Physical memory ...
-1
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1answer
51 views

Investigating linux server slow down

We have a code build server, fedora 13, which was working at medium speed for 4 users. Speed means building a code branch took 1.5 hrs max duration. It was having one quad core, 8gb ram, 200gb hdd. ...
1
vote
1answer
50 views

Why does recording a game with Fraps decrease performance?

I've run into some performance problems whilst recording some gameplay videos for Youtube. As I understand, Fraps saves the current frame pixel for pixel in a video file (in a way similar to a RAW ...
0
votes
2answers
181 views

Will overclocking my chipset increase the performance of integrated graphics?

My AMD Radeon HD 5830 recently broke (overheated because the fan stopped working), and I am currently attempting to run games on integrated graphics, on my chipset. Many games are responding slowly, ...
6
votes
1answer
7 views

Writing to subfolder is faster than writing to its parent

I use dd to measure write perfomance and observed something strange: writing to /data/emzed2 is faster than writing to /data. This is the way I measured the performance: $ dd if=/dev/zero ...
0
votes
3answers
231 views

CPU usage 99% constantly

My computer is running windows 8, and suddenly started running slowly. When I open the task manager, it tells me that the CPU is using 99% - sometimes the disk usages jumps up as well. The strange ...
2
votes
4answers
436 views

Slow Harddrive is Dragging the System

I have an HP Pro 3000 SFF running Window 8.1 Update 1 & Ubuntu 14.04 LTS. It uses an Intel G45s Chipset, a Hitachi HDS721050CLA362 500 GB harddrive, an Intel Core 2 Duo E8400 processor, and has 4 ...
1
vote
1answer
421 views

Why does my cursor speed slow down when my system is under intense network usage?

On some occasions of computer usage, my mouse acts very strangely. Whenever my computer is under intense network usage (i.e. watching an online video, downloading an application, patching a video ...
0
votes
1answer
49 views

Iperf network benchmark measures under-utilized?

I am working on two embeddded high performance network routers and I have connected them point-to-point via a 10Gbit optical fibre cable. I ran iperf benchmarks on them and when I connect through an ...
2
votes
1answer
42 views

Why do I get better performance on VMWare when I enable all cpus along with adding cpulimit?

I'm curious but at the same time also would like to share my findings of the increased gaming performance in VMWare by enabling all virtual cpus and limiting the VMWare process with cpulimit ...
0
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0answers
26 views

Windows will not open processes

I recently I come upon an unexplainable issue concerning my Windows 7 partition. When I woke up Thursday morning and logged into Windows, I discovered that it was acting really slow. It didn't take ...
6
votes
2answers
946 views

Is there a way to identify the busy (CPU-consuming) tab in Firefox?

Sometimes there's a nasty, guilty, CPU-hogging tab in Firefox that's maxing one of my CPU cores and making the whole browser sluggish. I'd like to find it and close it. Sometimes I get lucky, but ...
0
votes
1answer
140 views

Why does wmic tells my memory speed is 1333MHz, but Speccy says 665MHz?

I've checked my computer specs, and I saw I had memory in 1333MHz speed. I've checked it in wmic (see pic) and it's true. B ut i've checked it in Speccy (see pic) and it shows 665MHz. I've checked ...
1
vote
2answers
65 views

Does Windows still copy each file directly to disk, unlike Unix?

Unix was originally designed to perform file system operations in memory, and to update the disk blocks only every 30 seconds during sync. This resulted in a much faster user experience than MSDOS ...
-1
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2answers
58 views

Is software like tune up utilities essential?

Is software like tune up utilities necessary? Can't we perform the tasks using some other free ware tools and built in windows tools?
0
votes
1answer
255 views

i7 (first-gen) running memory on 1066Mhz vs 1600Mhz - any performance loss?

I tried to read about this, like what is the actual difference, but I could not find any benchmarks or helpful posts. Most of them are simple placebo effects, like "oh my god the 1600mhz module made ...
0
votes
0answers
892 views

Slow File Transfer over Gigabit Network

There are a few computers connected to a computer (Windows 7 x64) via a Gigbait network in order to transfer file, however lately the transfer of files has been really slow (11Mb/s) I have already ...
0
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0answers
51 views

Strange SSD Response Time Spike

I have a Samsung 840 EVO 1 TB SSD disk. I am streaming data to this sequentially at a rate of 60 MB/s to four different files (15MB/s each) with the size 168GB (preallocated) each in a circular ...
0
votes
1answer
724 views

Recommended RAID5 stripe size?

I have a RAID5 array built from 4 1TB drives. I initially set the stripe size to 1M since I will be storing large files (much larger than 1MB). The NTFS cluster size is 64KB (largest possible). ...
0
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1answer
44 views

How can internet speed test applet not just show slow speed, but hang?

I have one internet connection, which works bad. It should be 80/20, but works much slower. Also, when measuring it's speed, speed test applet not just show slow speed, but HANG. How can it be ...
-1
votes
1answer
960 views

Google Chrome working incredibly slow

So recently I have received a new laptop for work. It's pretty decent, i5 with 4GB of ram and hybrid SSD hard drive. Google Chrome was always my default browser and it works painfully slow here, I ...
0
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0answers
129 views

Toshiba Satellite P850 - Freezing and Stuttering

I've about exhausted all my known options at this point. I own a Toshiba Satellite p850 which was new in 2012. The laptop frequently (several times per minutes) locks up or stutters the entire system. ...
0
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0answers
313 views

Computer runs slow in the startup screen and booting of windows, programs fade in and fade out slowly

I think I have the exact same problem that is described here: PC running slow like molasses from BIOS to OS. Everything was working fine, and then suddenly, out of nowhere it took forever to boot my ...
0
votes
1answer
968 views

Memory Runs at Flex Memory Mode

I had 4 GB RAM installed, running in dual channel mode. RAM: Corsair TWIN2X4096-6400C5DHX (CM2X2048-6400C5DHX) Motherboard: Gigabyte GA-EP45-UD3R Channel 0: DIMM1, DIMM2 Channel 1: DIMM3, DIMM4 ...
1
vote
0answers
163 views

Hardware concerns for optimal ruby on rails development on ubuntu machine

I've been developing dynamic web sites using ruby on rails on a 5 year old mac mini which has been great except that it takes too much time -- 15 minutes or so -- to run my simple test suites. I ...
0
votes
2answers
264 views

Processor upgrade on a laptop vs. Ram upgrade. Also does ram always matter? [duplicate]

I have a Dell Inspiron 14r (N4110) with an Intel Core i3 and 4gb of ram. It runs very smoothly, however gaming on this laptop is very limited. This is mostly because of integrated graphics but i have ...
1
vote
0answers
66 views

Why might identical hard disks perform at different speeds?

I have just bought two WD 3TB Reds (WD30EFRX) for a FreeNAS box and whilst doing burn-in testing it seems like one is consistently taking about 10% longer than the other. So far I've done: a dd read ...
0
votes
1answer
116 views

Windows 8 slow after refreshing and rebooting

First, I apologize if this is in the wrong place. I use S/O a lot but not the other sites much. I have an HP Split X2 that has been very choppy as of late (takes several seconds to respond to any ...
0
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0answers
13 views

Page cache flushing behavior under heavy append load

I'm trying to understand the behavior of the Linux pdflush daemon when: The page cache is initially pretty much empty There is a large amount of free memory The system starts undergoing heavy write ...
0
votes
1answer
43 views

Speed issues when encrypting large file with mcrypt or alternatives

I want to encrypt a 100 GB file on my up to date iMac. It is hard to find out where the temp file is, so I can't find out the progress, but the encryption is already taking a full day. Is this normal? ...
0
votes
0answers
89 views

Copying between a remote share on Win2008R2 and Windows 7 is unbearably SLOW

I manage servers in 3 remote locations. Copying files from my workstation (Windows 7) and the remote servers (Windows 2008R2) is painfully slow. Yes my network card drivers are up to date, yes I can ...
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votes
3answers
323 views

14gb ram installed, only 6gb detected [duplicate]

I've checked each stick individually in the computer, by itself, to verify that the RAM was all in working condition. I have 2 sticks of 4gb RAM and 2 sticks of 3gb RAM. I'm not sure which are being ...
0
votes
0answers
144 views

Windows 7: Slow as can be - Low Resource usage

My main PC is a Dell from 2009 with Win7 SP1 that was originally a Vista machine. I installed a second HDD with Win7 on it and set Vista as the second drive. Its running with an Intel Core Q6600 ...
0
votes
1answer
139 views

How to tell, before buying, if a given graphics card will play Full HD video?

I am looking for the cheapest video card that would be capable of smooth playback of Full HD (1080p) video on a Full HD screen. An answer by @Mikhail on a related question briefly mentioned that: ...
0
votes
0answers
41 views

Network speed significantly reduced on Win Server 2008 DC

I started building a little server at home on a Gigabit network. I am running Windows Server 2008 32bits SP2. Before making the server a Domain Controller, I was able to get file transfers at an ...
0
votes
2answers
76 views

Upgrading MacBookPro

I'm using a Late 2011 13" MacBook Pro with an Intel i5 @ 2.4 GHz and 4 GB 1333 MHz ram. The computer has started to get older. I was going to upgrade the ram but since Mavericks come out, the ram ...