For questions concerning computer, or computer-related, performance. Please include metrics in your questions.
4
votes
0answers
201 views
View page source in Chrome is extremely slow
When making a page request to see the output of a large object, via a PHP's var_dump or print_r, a regular Chrome page will display the output quickly. To see a formatted output, I usually view the ...
3
votes
0answers
67 views
How can I pin point a USB file transfer bottleneck in Unix?
I'm experiencing very slow data transfer speeds over USB 2.0 on my nix box and was wondering how I can pin-point the cause of the problem.
I've looked into iotop and top but the cpu and mem figures ...
2
votes
0answers
290 views
ZFS raidz2 performance issues read/write speeds on Freenas
I'm having some performance issues on my home backup FreeNas box using a raidz2 configuration and I am wondering what might be causing it (not enough processing power, eco drives?).
It's running:
...
2
votes
0answers
134 views
“appleeventsd” slows down Word + EndNote
I'm writing my doctoral thesis on a Macbook pro using MS Word 2011 and Endnote X6 (Mac Word and Endnote on the newest version).
Word responses really slowly to any input like typing or scrolling, with ...
2
votes
0answers
72 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
126 views
Samsung 830 256GB ridiculously slow with SATA1
I'm well aware that my 6 years old laptop with it's SATA1 bus can't fully benefit the new Samsung 830 256GB SSD.
It's OK if it's the bus that caps the transfer speeds. SATA1 is fast enough for me. I ...
2
votes
0answers
133 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
250 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
198 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
81 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
2k views
How do I analyze excessive Windows kernel mode CPU usage?
My Windows XP machine recently started to semi freeze on me every odd reboot after a few minutes of usage (different programs / no additional prg start at all).
Update: I have now managed to get a ...
2
votes
0answers
38 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
22 views
How to use tunefs
Introduction:
I'm planning a performance-oriented clean install of OS X (10.6) on my Mac and I've decided (among other things) to split the hard drive into multiple partitions.
Two of them will be ...
1
vote
0answers
21 views
Hot File Clustering with multiple partitions
I'm planning a performance-oriented clean install of OS X 10.6 and I was wondering if the hot file clustering feature will exists only on the boot partition or if there will be one for each partition ...
1
vote
0answers
103 views
Over gigabit connection, Teracopy does 31MB/s, but Windows 8 does it at ~109MB per second?
I got my brain-melting first taste of Gigabit networking today, between my 2011 MacMini and Windows 8 Pro desktop connected via Cat.5e to Linksys WRT320N(sporting dd-WRT).
After making sure that the ...
1
vote
0answers
247 views
Windows 7 laptop suddenly very slow; cannot determine cause
I am working on a friend's laptop that became suddenly slow - to the point of not being usable. Boot time is fine, but Windows 7 takes forever to load and run. It is an HP Pavilion dv6.
Here is the ...
1
vote
0answers
171 views
SSD works slow under Windows 8
I have a problem similar to the one described in the question:
Windows is very slow with my new SSD
I believe what I need is to install the proper driver for either the SSD or the motherboard, but I ...
1
vote
0answers
147 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 ...
1
vote
0answers
191 views
Graphics-related “Slow motion” in Windows 7 64-bit OS, Persistant [Resolved]
What seems to be a DirectX problem in Windows popped up a few hours ago after a blue screen that was too fast to read the error code from. Its effect is that minimizing/loading windows are now slow. ...
1
vote
0answers
66 views
Computer became really slow after Microsoft account sync
My computer has always been very fast since I formatted and reinstalled Windows 8 x64.
Yesterday I did some things - the result is that my computer became VERY slow.
Game performance is greatly ...
1
vote
0answers
163 views
Notepad takes 8 seconds to open
I have an i7-3930K with 32GB RAM, using 256GB SSD, running Win 7 Ultimate.
It takes 8 seconds to open notepad after going
Win+r -> notepad -> enter
Why is this so SLOW? WTF?
Don't suggest ...
1
vote
0answers
125 views
Windows 8 UPNP much slower than accessing shared folder
Sharing from Windows Media Player in Windows 8 RTM (fresh install last week) to allow access to my libraries to other devices via dlna/upnp seems to give stuttering output and appears to be ...
1
vote
0answers
86 views
Partitions, symlinks, mounting as folders and performance
I'm going to have a 128-GB SSD which will contain Windows 8 and most applications, and a 1-TB hard drive which will contain most of the rest (large games, documents, select frequently overwritten ...
1
vote
0answers
97 views
Optimum SSD size for Intel SRT?
According to Intel, the utilizable cache size on the SSD for SRT is between 18.6 GB and 64 GB.
If I buy a "64 GB" SSD I only get 60 GB of usable space, thus underutilizing the SRT technology a bit ...
1
vote
0answers
76 views
2-thread Perl program slower if run using a RAMdisk within a Virtualbox?
I run a perl script inside a Virtualbox (both the host and guest OS are Windows 7).
The Virtualbox has been given 4 CPUs out of 8 (everything runs on a Intel i7) and 3 GB RAM (out of 8 available).
...
1
vote
0answers
34 views
SSD vs HDD for file upload and reconstruct chunk file
Using HTML5, I will have an uploaded files roughly 2 - 10GB per client, uploaded to a server. The script will chunk each file into 100MB pieces, and reconstruct the file after everything uploaded into ...
1
vote
0answers
61 views
SSD performance
I recently upgraded to a Kingston Hyper-X 120GB SSD, when I run Crystaldiskmark my scores look really slow, my MB (gigabyte 775) does not have an option for ACHI in the BIOS,
I'm wondering if that's ...
1
vote
0answers
183 views
Booting Windows 7 on an SSD while MTP device is connected takes over 30 seconds — without: 8 seconds
I recently acquired an SSD and I came across a very strange problem.
If I boot Windows 7 without my MTP device connected (Samsung Galaxy S2) it will boot always in maximum 8 seconds.
If I boot ...
1
vote
0answers
215 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 ...
1
vote
0answers
226 views
Poor VirtualBox performance on Windows 2008 R2
I'm running a Ubuntu Server VM on a Windows 2008 R2 host, and I'm getting very poor I/O performance. See the following screenshot that shows my processes are severely I/O bound (i.e. 96.0% wait)
...
1
vote
0answers
1k views
System halts for a fraction of second after every 2-3 seconds
I'm using Windows 7 on my HP ProBook 4250s. The problem I face is that my system halts for a fraction of second after every 2-3 seconds. These jerks are not letting me concentrate or work properly. ...
1
vote
0answers
355 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 ...
1
vote
0answers
45 views
writting becomes slow after few writes
I am running an embedded Linux on arm with a SD-Card. While writing huge amounts of data
I see bizarre effects. E.g, when I dd a 15 MB file few times, it writes the file (normally)
in less than 2 ...
1
vote
0answers
30 views
Performance monitor for unlimited time
How can I run the performance monitor for unlimited time? (about 2-3 weeks)
thanks !
1
vote
0answers
78 views
Making iostat show both sectors and kilobytes read
I'm running iostat -d -x on redhat enterprise 6.1 (over vmware, if that makes a difference), and I want to see reads and writes both in sectors and in kilobytes, but only seem to be able to display ...
1
vote
0answers
152 views
Microkingdom USB headset not playing sound properly
My headset is playing sound that should only be playing on the left side on both left and right sides of the headset, but sound that's coming from the right is on the right side.
It's also odd that ...
1
vote
0answers
145 views
cset shield --kthread on: should I use this?
I'm reading up on cpu shielding using Alex Tsariounov's cset utility here: https://rt.wiki.kernel.org/index.php/Cpuset_Management_Utility/tutorial
In the tutorial I'm finding the wording around ...
1
vote
0answers
60 views
Which Windows services and startup programs can I disable/modify to optimize performance/security?
For Windows Vista SP2 and Windows 7:
I use this stand-alone (no LAN) computer at home exclusively to browse the internet, nothing else!.. I have another computer I use for development and testing ...
1
vote
0answers
88 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 ...
1
vote
0answers
928 views
Disable Offline Files (mobsync.exe) on Windows 7 Home
This morning I was watching the CPU graph of a Windows 7 Home laptop and noticed that every few seconds, the CPU would spike several percent. I watched the processes and determined that it was ...
1
vote
0answers
367 views
Virtualized guest vs host CPU usage
I am using qemu with kvm as my hypervisor. I am running a gentoo guest on an ubuntu host. The guest is being given a single processor.
When I run a compute intensive job (say empty-loop) I get almost ...
1
vote
0answers
220 views
Dell Inspiron has become unresponsive
My Dell Inspiron laptop was slow from the beginning but I was able to do all my work comfortably. The last few days, though, it has become too slow to do any work.
It is unresponsive for any type of ...
1
vote
0answers
223 views
Firefox not using cache?
Some times I have issues with the wireless connection where I live. That issue is irrelevant to this (there are two IT departments managing this thing; there's nothing I can do about it). Most of ...
1
vote
0answers
508 views
Can I disable Windows 7's indexing/scanning of dvd contents?
When I try to copy data from a DVD on my Windows 7 machine, I keep running into this problem. I open the DVD drive in windows explorer to browse the files, select the ones I wish to copy then paste ...
1
vote
0answers
395 views
Moving files to outside of hard drive platters?
Currently I am working on cheap ways to improve my hard disk performance on my PC. I know that one way to do so is short stroking, but I would like to utilize my entire disk, not just part of it. I ...
1
vote
0answers
95 views
Laptop takes 1-2min for network connection to start on wakeup, even when wired
I have an HP Pavilion dv6. When I got it, the first thing I did was to rip out the HD and put in an SSD with a clean install of Windows 7 Home Premium on it (only mention this b/c I'm not sure how it ...
1
vote
0answers
340 views
continuous hard disk access - slowing down my machine
I find from the hard disk access LED on the front of my machine that the hard disk is being accessed more often and probably because of that, my machine is quite slow. The machine becomes unresponsive ...
1
vote
0answers
218 views
Ubuntu 10.04 slow on a Dell Optiplex 360
My desktop is becoming very slow - even when the load as displayed by the w command is around 2 or so. I run eclipse, crashplan, dropbox, and some times matlab. Chrome is the browser used. I have 4GB ...
1
vote
0answers
61 views
Is there an Integer Linear Programming software that returns also non-optimal solutions?
I have an integer linear optimisation problem and I'm interested in feasible, good solutions. As far as I know, for example the Gnu Linear Programming Kit only returns the optimal solution (given it ...
1
vote
0answers
90 views
Nautilus reacts slowly, information about opened directory disappears
I use the fallback mode in GNOME 3 and Nautilus.
When you select Menu - Location - Home (or any other directory), Nautilus opens this directory. I can move between directories without problems.
...
