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

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4
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0answers
134 views

After plugging in a USB device, Win7 severely slows. What causes this and how could it be fixed?

This is the second PC undergoing this condition, both running Win7. On PC1 a Logitech device was connected through USB before installing it's branded driver (allowing windows to auto-install it), and ...
3
votes
0answers
2k views

Very slow volume expand on Synology ds2413+

I've posted this elsewhere on the internet aswell, and will obviously reply in both places if a proper solution is found. I am attempting to expand SHR volumne (2x4TB, 1x2TB) with additional 4TB ...
3
votes
0answers
275 views

Copying from WHS 2011 backup very slow

I'm setting up a new computer to replace one of my old ones, and part of doing so is extracting my Home folder from a backup I made just before wiping the old one. However, copying from the mounted ...
2
votes
0answers
127 views

MIcro SD card gets slower after partial fullfillment

I have a micro SD card from Kingston - 32GB class 10 When i'm writing on it using usb card reader or my phone, average write speed is about 6MB/s But after about 10GB of data written into it, ...
2
votes
0answers
56 views

AMD Processor state failures

I have a HP Pavillion dv6-6123cl Entertainment PC with a locked bios. I use a program called K10Stat in order to get around this and overclock anyway. I have AMD A6-3400 APU with Radeon(tm) HD ...
2
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0answers
206 views

How to force the Linux kernel reclaiming cache memory rather than using swap?

I have a PostgreSQL-driven web service on two Debian servers, one a vhost running Linux kernel 3.2.0-2 with 2GB RAM and the other a dedicated server running Linux kernel 2.6.26-1 with 6 GB RAM. ...
2
votes
0answers
431 views

HDD very slow performance after full copy from SSD

The PC: Core i7-4770, 16GB RAM. There are 120GB SSD and 1TB HDD (new without any bads). On the SSD I had Windows 8.1 installed with all other stuff. Someday all programs exceeded 120GB limit and I ...
2
votes
0answers
103 views

Show dial up connection status in Task Manager

In Windows 8.1, Task Manager shows Wi-Fi, Disk, CPU usage graph in Performance tab. But, it doesn't shows usage of a dial up internet connection. How can I add dial up stats in task manager. Here are ...
2
votes
0answers
85 views

some programs running much slower after mscvrt runtime redistributable delete/reinstall

UPDATE: It appears that there may have been an unfortunate coincidence. It seems that right around the time I was doing these builds and deletions of redistributables, my laptop power adapter was ...
2
votes
0answers
394 views

LSI SAS 2308 MPT2SAS Linux Read/Write performance

LSI SAS 2308-8e (6Gb/s per Lane) PCIe 3.0 card. Average Read/Write Raw performance for 4 SSDs is very low around 430 MB/s (Expected 2 GB/s).I am having Intel Core i3 with quad cores and 4 GB RAM. ...
2
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0answers
213 views

USB Keyboard and Mouse slow to activate using docking station for Lenovo T430

I just recently upgraded to a T430. Happy with the laptop but one thing I find annoying is that when I use it through the docking station - it takes several minutes ie 3-5 for the USB keyboard and ...
2
votes
0answers
121 views

What desktop computer hardware specifications are most important for database heavy applications?

I am purchasing a new personal desktop computer with the hope of improving performance for database-heavy applications (mostly data mining). I will want versatile hardware for all sorts of future ...
2
votes
0answers
248 views

Poor write performance on ecryptfs

I did a bit of benchmarking with ecryptfs and dm-crypt, and got some interesting results. All the following were done with a Btrfs filesystem, using dd to copy a ~700MB file to/from a ramdisk with the ...
2
votes
0answers
1k views

Windows 8.1 Process Migration Limits CPU frequency scaling

Summary: I've noticed that with Windows 8.1 on my laptop, running a single CPU intensive program does not cause the CPU frequency to scale to its maximum value. I suspect that this is because of ...
2
votes
0answers
317 views

Super slow SDD write speeds with RAID 1

I have a very new computer system, configured in RAID 1, but was surprised that the write speeds were extremely slow! Here is a snapshot of my computer setup: Motherboard: Asus Z9PE-D8 WS ...
2
votes
0answers
147 views

How much performance reduction is ok for a linux router?

I am having thew following (simplified) setup: I have a private Subnet where my PC is located. The subnet goes over a virtualized server into the internet. The server uses internally two subnets: One ...
2
votes
0answers
242 views

Problems with buffered disk read performance

I have two identical linux boxes (running ubuntu 13.4) with identical hardware including a WDC WD20EARS hard disk. I noticed that my main system got unsually slow and performed a number of HD tests. ...
2
votes
0answers
811 views

Buffalo Router WZR-HP-G450H slow and unstable

I bought a Buffalo WZR-HP-G450H router. Problem 8 device connected to it via wireless. When power it on, the connection speed is very fast, about 5MB/s while transfer files between a wired server ...
2
votes
0answers
99 views

Low bandwidth only on Windows XP

Hi I own really old PC and I've 10Mbps/1Mbps Plan. Internet is distibuted with router over whole house. The old PC uses 802.11b (up to 11Mbit/s download) Wifi card and has Windows XP+SP3 installed. ...
2
votes
0answers
450 views

nfsstat authrefrsh almost equal to calls

I mounted a dir from my server through nfs (v3) on my LAN and if I run nfsstat I get # nfsstat -rc Client rpc stats: calls retrans authrefrsh 2527772 0 2527782 Is this ...
2
votes
0answers
795 views

When tab groups are loaded, Firefox becomes unresponsible for minutes (Unresponsive script)

I have several tab groups (~ 20) in Firefox. I can start the browser without any problems. However, as soon as I … click at the "Group tabs" icon in the toolbar, or right-click on a tab and hover ...
2
votes
0answers
276 views

Improving Chrome performance on OSX

There are a number of sites that do not display properly on Safari and I need to switch to Chrome. Although when the content of the sites requires flash player, Chrome will consume a significant ...
2
votes
0answers
389 views

Microsoft Security Essentials: keep download scans but disable local activity scans

In Microsoft Security Essentials, I used to disable "Monitor file and program activity on your computer" but enable "Scan all downloads." Now, Microsoft Security Essentials (MSSE) 4.0 removed the ...
2
votes
0answers
109 views

Laptop is super slow on network

So on our network we have a bunch of wireless macs and window Operating laptops, we have a network setup with 802.11g,b,n. All the laptops seem fine except one which is only getting speeds of 54Mb. I ...
2
votes
0answers
94 views

Have anybody tested R multicore packages on 10-core Xeon how do they scale in comparison with case of 4 core machine?

Have anybody tested R multicore packages (for example : parallel, multicore, snowfall, foreach) on 10-core Xeon ? How do they scale in comparison with case of 4 core machine ? What algorith have you ...
2
votes
0answers
44 views

Are there guidelines for the performance implications of adding multiple usb/firewire drives to a Mac?

I have noticed that I get a significant performance drop on a Mac Pro with more than 5 daisy chained firewire 800 drives. Task switching grinds to a halt, and the machine often beachballs between ...
1
vote
0answers
33 views

Why Computer is so slow after boot?

This situation has happened to me multiple times and I've tried to diagnose the problem unsuccessfully. This has to deal with my work PC. Machine/Software Specs: Windows 7 x64 32GB Ram Core i7 (ivy ...
1
vote
0answers
48 views

“Access is denied” to Admin when using Sysinternals Contig to defrag the $LogFile metadata file

I have folders with hundreds of thousands, to over a million files and subfolders in each parent. I'm reading that the NTFS log file may be responsible for slow file creation and other actions. How ...
1
vote
0answers
41 views

Thousands of page faults per second while page file lies empty

So, in my office system, things are going crazy. Every thing was extremely slow, so much so that switching tabs on chrome took 10 seconds. So, I checked the performance monitor for the issues. ...
1
vote
0answers
61 views

How to achieve best browsing performance using Polipo?

I'm using Polipo to browse the web, I've set up the config file as follow (consider that I have 4 Gb of DDR3 ram, and my computer is quite fast): I've noticed that seems better if I disable the ...
1
vote
0answers
34 views

Windows 7, Hibernation Disaster

I think that I messed up my lap top after accidentally putting it into hibernation. I was at school and at the end of class I was putting my computer into sleep mode. Unfortunately I accidentally ...
1
vote
0answers
16 views

Assessing Performance in Process Explorer: Varying Block Sizes

I am trying to assess the performance of my scientific software using Process Explorer, with the files both locally on our blade server (Dell VRTx, Windows Server 2012) and over the network from ...
1
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0answers
102 views

What is Prime95 benchmarking?

I've recently had to benchmark the CPU performance of a variety of operating systems on identical machines. I've been using the 'benchmark' functionality of Prime95 to obtain a consistent test. I've ...
1
vote
0answers
254 views

iTerm2 performance vs Terminal.app

I prefer iTerm2 for its features, but Terminal.app outperforms it in terms of responsiveness. I mostly notice this in Vim: iTerm gets choppy during scrolling and/or rapid cursor movement. Is there ...
1
vote
0answers
28 views

Is there a way to “undercommit” memory in Linux (VPS burst memory woes)?

I've been noticing occasional drastic performance hiccups in my application hosted on a VPS. My VPS plan has 1GB guaranteed RAM and 1GB "burst" RAM. Occasionally the app will become extremely ...
1
vote
0answers
62 views

Windows internet sharing uses 50% of my CPU

I discovered that svhost.exe process is using almost 50% of my CPU time when computer was almost idle - I was downloading big file with USB 3G modem with 80kB/s speed. I have relatively fast CPU ...
1
vote
0answers
57 views

Slow Windows Application Startup

I have Windows 8 Pro/i5 3320M laptop with 8GB memory. Java based applications such as Eclipse, Phpstorm takes about 15-30 mins to load. (i assume issue is with java apps, others work fine). I tried ...
1
vote
0answers
28 views

Why does top and Google Compute Engine give me two totally seperate cpu % values?

So to preface this, I haven't done much in Linux since a decade ago when I was in college, so I may just be doing something stupid. However, for this project I am working on I'm performing a load ...
1
vote
0answers
26 views

Some applications slow on network (win 8.1), where to start?

I recently got a new computer with windows 8.1. I identified at least two applications are very slow when the are using the network. This is the MS dynamics AX client (very slow all the time) and ...
1
vote
0answers
126 views

Linux MD software raid stripe cache size

From what I can piece together the /sys/block/md0/md/stripe_cache_size is for raid5 and 6 set at a very low default value to avoid starving machines for memory. By increasing this value you can get a ...
1
vote
0answers
63 views

Windows 7 - Acer Aspire M5811

I have a problem with my Windows 7 Desktop PC. Today I used it normally and it turned off normally to, but the next time I tried to turn it on, it became extremely slow. It's normal until I need to ...
1
vote
0answers
148 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 ...
1
vote
0answers
204 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 ...
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vote
0answers
73 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 ...
1
vote
0answers
307 views

Slow write speed on external SSD

I am experiencing slow write speeds using an external Inatek USB 3.0 2.5" External Enclosure (UASP supported) with a Samsung 840 120GB drive. I just started using this setup on a late 2013 iMac as an ...
1
vote
0answers
37 views

Windows boot performance - 52 seconds to initialize drives?

I had an issue with my primary SSD and I replaced it with another from a different brand, and at the same time I reordered my other 2 mechanical (C=ssd, D & E=mechanical). Now, when I load ...
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0answers
197 views

Java (SE) program execution is too slow on Debian Wheezy… do I need to “tune” the JVM?

SuperUsers. I wrote a desktop program to execute a simulation process (not worth copying the code here... it's quite a long program). If I run it on a MacBook Pro (Intel Core i7 2.2 GHz, 4GB RAM), it ...
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0answers
229 views

Windows 7 hangs upon input events and opening sockets

I'm using a work laptop running Windows 7 64-bit Professional. The laptop is a Dell Studio XPS and has the following specs: Intel Core i5 M460 Quad-core 2.53GHz 6GB RAM ATI Mobility Radeon HD4670 ...
1
vote
0answers
124 views

Games in windowed mode lag (with AMD GPU)

Before I start, I tested the latest beta and the latest stable (as of now) drivers, both had this problem. The problem is also not specific to any game, like it happens in Battlefield 4 and Trine 2. ...
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0answers
23 views

Utility service that logs total network usage

I would like to know the total bandwidth our internet provider essentially provides to the many competing devices in our home. Is there a simple windows service that uses a wireshark like trick to log ...