Why is Java VM on Win32 so slow??

I use Mozilla 1.3b browser. But I switch to IE when I have to use Java apps, because the Microsoft VM is so much better than the Sun VM. Just try it out. Go to www.naperville-lib.org and click on the "Library Catalog/Your Account" link. Check out how slow that app is on the Sun VM. Compare with MS VM. Check out other Java apps.. like www.sodaplay.com. Noticeably faster on MS VM.
This is just unacceptable. Java apps run like molasses on my machine, as if I were running a 300MHz machine (when in fact I'm running at 1GHz). I've heard other complaints about this too, so I know it's not just me.
Can we expect a faster VM any time soon?

Agree!!! MS VM is really better than Sun VM for runing Applet, both concerning performance and stability. It's a bad news that MS VM will be replaced by Sun VM in future. See http://news.com.com/2100-1001-983169.html.

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Why is java.io.InputStream.read() so slow???

Hi everyone,
I have an applet that reads a file via url. I open the file and read from it using this code:
URL url = new URL (http://"www.somesite.com/target.txt");
try {
InputStream is = url.openStream();
//reads the raw data from the file
for(int i = 0; i != -1;) {
i = is.read();
//determines dimensions needed for the array
if(i == '~') {
dataDimension++;
rawData += (char) i;
}catch(IOException ioe) {}
The code works without errors. (hopefully the above does too, I dont think I introduced any errors when I pasted it over...) The problem is it is unbelieveably slow. When I run it on my file of 85kB in size, the code runs for several minutes on this loop reading in the data in the file. I have no idea why this is...the problem appears to have little or nothing to do with bandwidth as ive tried it on dsl, 56K etc. Ive even writtin a variant that reads the data off my hard drive. No matter where the file resides and how fast of a pipe I give it, it takes just about the same time to complete. My assumption is that either Strings have an increasingly harder time concatenating another string to its end as its size increases or InputStream needs to be layered in another reader object for some strange reason.
Does anyone have any idea whats happening here? Is there a faster way to get characters from a file into a String?
I really do appreciate any help I get on this one!
Thanks in advance for posting.
Sincerely,
Nickolas Fellows
[email protected]

Haha, Im an idiot...I answered my own question...or at least I think I did.
Turns out I shoulda been using a StringBuffer and initializing it with a size large enough to hold the file right off the bat. I am assuming making the string recreate its self everytime its size got exceeded was the problem.
Thx for letting me waste everyones time again :)
Sincerely,
Nickolas Fellows
[email protected]

Why is java slow?

Why is java so slow? I think sun needs to make a big improvement on the speed of loading a java program/applet.!!

It is slower because it is an interpreted language. There have been many improvements to the language from compilation and through newer JVM's that further optimize the code. It is someting you must work w/ when you use the language.

Why learn Java now?

I'm new to Java programming and have developed some small demo classes.
I have exp with other Visual languages and I feel like I'm taking a step back in time writing code in Notepad and compiling and running from dos etc.
I have several classes and lots of code lines to do a simple thing in swing like create a frame and a simple menu panel.
I thought Java required less code but so far it requires 3 times an much as other languages!
What visual tools or IDE�s exist for Java development other than Sun ONE Studio?
Why learn java now? The number of jobs posted online seams to be higher for Java that any other language out there like vb.net, C++ etc.
Any Comments of the Future of Java Jobs?
Running Java:
My apps run slow on XP, 384M ram.
Do production Java applications suffer from slow execution of the JVM layer?

Java code is easier to understand and more stable than "faster" languages. There is more flexibility and extensibility than in other languages, and the error-processing system is quite advanced. There are also very powerful tools you can use out-of-the-box, like JOptionPane:
import javax.swing.*;
public class Foo
    public static void main(String[] args)
        String pass = JOptionPane.showInputDialog(null, "Please enter your password");
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Also see javax.swing.JColorChooser.
-Tim

Is java program meant to be slow?

I dont know why...
I have made a simple uploader which can upload 3 files at a time simultaneously...and it's a gui based.
however, it runs quite slow, and it uses alot of memory.
Is Java meant to be this slow?
btw, will using AWT instead of Swing improove the performance?

I guess the more assumption of memory, the slower the
program is, right?Wrong. You can improve performance by caching some objects and thus using more memory. Or you could increase locailty by solving the same job with less memory and thus increase performance. Basically you there is no direct relation between memory usage and performance.
well, i could see how much memory is used simply by
ctrl+alt+del, the task manager.That gives you only a rough overview of the system, basically because of stuff like shared libraries, shared memory, other resources that appear as allocated memory (mmaped files in UNIX, for example), ...
However, what is a profiler? http://www.google.com/search?q=profiler
by slow, I mean, well, the program effects alot on
other softwares to execute slower, for eg, open a
browser, open My Computer, etc.That sounds like your program uses an idle loop. You probably implemented it in an un-effective manner. You could have made that mistake in any other language as well (I even think it's easier to fix in Java).
btw, I hypothesize that I could follow the suggestion
of uploading sequentially, because it can also reduce
the amount of objects used to reduce memory usage.since your assumption before is not necessarily true, neither is this one.
Or, if you people are kind enough, maybe you could
check my whole source code? well, it is about 9 pages
long.Probably not, but post the loop that does the file reading and uploading, as my guess would be that that is the bottleneck. Otherwise use aforementioned profiler to find out which part is slowest.

Why does my iPhoto open and run slow since upgrading to OSX 10.8.5

Why does my iPhoto open and run slow since upgrading to OSX 10.8.5? I have an Imac - Intel 2.5 GHz quad core I5 - with 20 GB of memory. Before the upgrade it was much faster.

Why does my iPhoto open and run slow since upgrading to OSX 10.8.5? I have an Imac - Intel 2.5 GHz quad core I5 - with 20 GB of memory. Before the upgrade it was much faster.

Why is my mid 2007 iMac so slow now that I've loaded 10.9.4

Why is my mid 2007 iMac so slow now that I've loaded 10.9.4? Everything seems to be slow. It was quick enough on 10.4. I now have wireless connection issues, and wired keyboard connection issues?
2.4 GHz Intel Core2 Duo, 4GB 667 Mhz DDR2 SDRAM

Hi there - thanks. No, I haven't run anything like Clean My Mac - what would you suggest?
EtreCheck version: 1.9.15 (52)
Report generated September 9, 2014 at 8:56:44 PM PDT
Hardware Information: ?
iMac (24-inch Mid 2007) (Verified)
iMac - model: iMac7,1
1 2.4 GHz Intel Core 2 Duo CPU: 2 cores
4 GB RAM
Video Information: ?
ATI,RadeonHD2600 - VRAM: 256 MB
iMac 1920 x 1200
System Software: ?
OS X 10.9.4 (13E28) - Uptime: 14 days 9:40:19
Disk Information: ?
SAMSUNG HD103UJ disk0 : (1 TB)
S.M.A.R.T. Status: Verified
EFI (disk0s1) <not mounted>: 209.7 MB
Macintosh HD (disk0s2) / [Startup]: 999.35 GB (321.09 GB free)
Recovery HD (disk0s3) <not mounted>: 650 MB
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Apple, Inc. Keyboard Hub
Apple Inc. Apple Keyboard
Seagate FA GoFlex Desk 1.5 TB
S.M.A.R.T. Status: Verified
disk1s1 (disk1s1) <not mounted>: 32 KB
FreeAgent GoFlex Drive (disk1s3) /Volumes/FreeAgent GoFlex Drive: 1.5 TB (20.68 GB free)
Apple Inc. Built-in iSight
Apple Inc. Bluetooth USB Host Controller
Apple Computer, Inc. IR Receiver
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Mac App Store and identified developers
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[loaded] com.seagate.driver.PowSecDriverCore (5.1.1) Support
[not loaded] com.seagate.driver.PowSecLeafDriver_10_4 (5.1.1) Support
[loaded] com.seagate.driver.PowSecLeafDriver_10_5 (5.1.1) Support
[not loaded] com.seagate.driver.SeagateDriveIcons (5.1.1) Support
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[not loaded] net.pocketmac.driver.BlackberryUSBDev (3.0.9) Support
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Problem System Launch Daemons: ?
[failed] com.apple.printtool.daemon.plist
[failed] com.apple.wdhelper.plist
Launch Daemons: ?
[loaded] com.adobe.fpsaud.plist Support
[loaded] com.adobe.SwitchBoard.plist Support
[loaded] com.google.keystone.daemon.plist Support
[loaded] com.microsoft.office.licensing.helper.plist Support
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[running] com.adobe.AdobeCreativeCloud.plist Support
[running] com.brother.LOGINserver.plist Support
[loaded] com.google.keystone.agent.plist Support
[running] com.seagate.SeagateStorageGauge.plist Support
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Microsoft AU Daemon
SpeechSynthesisServer
iTunesHelper
AdobeResourceSynchronizer
Google Drive
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Microsoft Outlook
ExpanderDaemon
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o1dbrowserplugin: Version: 5.4.2.18903 Support
Google Earth Web Plug-in: Version: 7.1 Support
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AdobeAAMDetect: Version: AdobeAAMDetect 2.0.0.0 - SDK 10.7 Support
FlashPlayer-10.6: Version: 15.0.0.152 - SDK 10.6 Support
AdobePDFViewerNPAPI: Version: 10.1.6 Support
DivXBrowserPlugin: Version: 2.1 Support
Flash Player: Version: 15.0.0.152 - SDK 10.6 Support
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googletalkbrowserplugin: Version: 5.4.2.18903 Support
QuickTime Plugin: Version: 7.7.3
AdobePDFViewer: Version: 10.1.6 Support
SharePointBrowserPlugin: Version: 14.1.0 Support
Silverlight: Version: 5.1.20125.0 - SDK 10.6 Support
JavaAppletPlugin: Version: 14.9.0 - SDK 10.7 Check version
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wpa
html5video
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BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
AirPlay: Version: 2.0 - SDK 10.9
AppleAVBAudio: Version: 203.2 - SDK 10.9
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iTunes Plug-ins: ?
Quartz Composer Visualizer: Version: 1.4 - SDK 10.9
User iTunes Plug-ins ?
TuneUp Visualizer: Version: (null) Support
User Internet Plug-ins ?
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WebEx64: Version: 1.0 Support
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DivX Support
Flash Player Support
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FreeAgent GoFlex Drive [Local] (Last used)
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172 MB Finder
135 MB Microsoft Outlook
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94 MB com.apple.IconServicesAgent
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706 MB Inactive RAM
655 MB Wired RAM
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Why does Java Application not working with Macromedia Flash 5 or MX?

Why does Java Application not working with Macromedia Flash 5 or MX?

Who says they don't?
Although I don't know much about those I'd think they should be able to talk to Java Aps using Sockets or request Servlets ...
Spieler

Why is Java update asking me to install openoffice?

I have installed Java jdk 1.6.
Now the update notification is asking me if I want to install openoffice.
I am not interested in that kind of notifications. (By the way I already have installed open office)
There needs to be a differentiation between java updates and other updates (3th party tools). Then I can switch off that kind of notifications.
I am only interested in Java updates.
Why is Java update asking me to install openoffice?
Thanks and regards,
Cees

It's probably asking you to update to iOS 8.2, which includes support for the upcoming Apple Watch.

Unicode String in JFrame's Title Bar / why is java a non-Unicode pgm in XP?

My big question:
Why is Java detected as a non-Unicode program by Windows XP?
I need to do the following before I can write Japanese characters on the JFrame's title bar on Window XP:
From the Control Panel -> Regional Settings and Languages -> Set the Language for non-Unicode Program to Japanese
Thanks in advance,
Noel

Hi Noel,
I'm only guessing here, but I suspect this is still the case...
Under JDK1.3, the title bar produced by a JFrame is provided by the Windows OS, rather than Java itself. You'll find that trying to display foreign characters in a JFrame's title bar on an English Windows system nigh on impossible (you're left with everyone's favourite little rectangles instead). AFAIK, Sun were looking to change this in the future, but I've no idea if they've got there yet.
Windows XP likely refers to Java as a non-Unicode program because it's looking at the main frame. Because the frame is produced by Windows itself (which last I checked was about as Unicode-compliant as my car is), it holds a different encoding to anything else within Java.
At least that's my stab in the dark. ;-)
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Martin Hughes

Why are Java files listed as needing repair in Disk Utility?

Why are Java files always listed as needing repair in Disk Utility?

FrenchToast wrote:
Baltwo, bull's eye, as always!
X423424X's question is pertinent too: you usually need to repair permissions after some major upgrade or update, not on a regular basis. Is there a particular reason why you'd often try to repair permissions? Here's more on the subject.
Repairing permissions after an update or upgrade is harmless, but I would question the need to do it even there. The Apple update itself should set the correct Permissions. I still do this, really as a hangover from Tiger days -- not certain it was really ever needed there either -- and because it's a habit that's hard to kick, but it's never found anything to repair...but for one buggy exception, which was the 10.5.8 Combo update. Running it once and then repairing Permissions created a real error. It was discovered the Combo needed to be run twice back to back and then Permissions repair. In fact, one would have been better off not running Permissions for that update to begin with. There it wasn't harnless.
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HT4528 Why is the WiFi and browser so slow on iPhone 5?

Why is the WiFi and browser so slow on iPhone 5? I've noticed they are not as quick as other smart phones and have seen this brought up in forums. Also, the WiFi was slow with my iPhone 4 anyone know what the deal is?
Thanks in advance

Sadly that spiffy reply was of no use. Browser is so slow and in looking at 3 different iPhones I have noticed there is a serious wait for any simple page to come up like MSN maybe its the iOS maybe Safari maybe should reset daily. Truly not impressed Apple can you here us now? Probably not... to busy restarting or resetting.
Truly hope it improves in a hurry.

Why is the download/upload speed so slow on my MBA (about 5 times slower than my PC)?

Why is the download/upload speed so slow on my MBA (about 5 times slower than my PC)?

Are you on band 13 or band 4? 13 is the original LTE band and remains relatively congested. Band 4 is the XLTE band and is less congested and has higher overall potential bandwidth (15 MHz vs 10 MHz). Even so, 7 Mbps is more than enough for doing stuff on your phone and is not considered slow.
To check band,
dial *3001#12345#*
select serving cell info
frequency band will say 13 or 4
FInd an area with band 4 and retest.

Why does Java have such a large footprint?

I've been curious about this topic for a while, but I haven't ever looked into this to any depth. I also posted this to stackoverflow but haven't gotten any solid responses so far:
http://stackoverflow.com/questions/1107991/why-does-java-have-such-a-large-footprint
Java - or at least Sun's Hotspot JVM - has long had a reputation for having a very large memory footprint. What exactly is it about the JVM that gives it this reputation? I'd be interested in a detailed breakdown: how much memory goes to the runtime? (The JIT? The GC/memory management? The classloader?) Anything related to "auxiliary" APIs like JNI/JVMTI? The standard libraries? (Which parts get how much?) Any other major components?
I realize that this may not be straightforward to answer without a concrete application plus VM configuration, so just to narrow things down at least somewhat: I'm primarily interested in default/typical VM configurations, and in a baseline console "Hello world" app as well as any real-world desktop or server app. (I'm suspecting that a substantial part of the JVM's footprint is largely independent of the app itself, and it is in this part that I'd like to zoom in, ideally.)
I have a couple of other closely related questions:
Other similar technology, such as .NET/mono, don't exhibit nearly the same footprint. Why is this the case?
I've read somewhere on the intarwebs that a large portion of the footprint is due simply to the size of the standard libraries. If this is the case, then why is so much of the standard libraries being loaded up front?
Are there any efforts (JSRs, whatever) to tame the memory footprint? The closest thing I've come across is a project to reduce the on-disk footprint of the JVM [1] and to modularize the standard library [2].
I'm sure that the footprint has varied over the past decade or so with every new version of Java. Are there any specific numbers/charts chronicling precisely how the JVM's footprint has changed?
[1] http://blogs.sun.com/jtc/entry/reduced_footprint_java_se_bringing
[2] http://blogs.sun.com/theplanetarium/entry/project_jigsaw_modularizing_jdk_7

yangzhang wrote:
I've been curious about this topic for a while, but I haven't ever looked into this to any depth. I also posted this to stackoverflow but haven't gotten any solid responses so far:
http://stackoverflow.com/questions/1107991/why-does-java-have-such-a-large-footprint
Java - or at least Sun's Hotspot JVM - has long had a reputation for having a very large memory footprint. What exactly is it about the JVM that gives it this reputation? I'd be interested in a detailed breakdown: how much memory goes to the runtime? (The JIT? The GC/memory management? The classloader?) Anything related to "auxiliary" APIs like JNI/JVMTI? The standard libraries? (Which parts get how much?) Any other major components?
Presumably versus some other VM. I would suppose the fact that much of the VM is written in java has something to do with it.
I realize that this may not be straightforward to answer without a concrete application plus VM configuration, so just to narrow things down at least somewhat: I'm primarily interested in default/typical VM configurations, and in a baseline console "Hello world" app as well as any real-world desktop or server app. (I'm suspecting that a substantial part of the JVM's footprint is largely independent of the app itself, and it is in this part that I'd like to zoom in, ideally.)
I have a couple of other closely related questions:
Other similar technology, such as .NET/mono, don't exhibit nearly the same footprint. Why is this the case?
Not sure I agree with that. What size do you see with a .Net app that uses 3.0/3.5?
I've read somewhere on the intarwebs that a large portion of the footprint is due simply to the size of the standard libraries. If this is the case, then why is so much of the standard libraries being loaded up front?
Good question. There is a feature that allows multiple VMs to use the same memory footprint version of the loaded libraries. That is a new feature and it isn't clear to me if it covers the entire API. I do not know if that is dynamically built.

Why is the same wirelles connection too slow for an iphone4 when it is quite fast to an iphone5?

Why is the same wirelles connection too slow for an iphone4 when it is quite fast to an iphone5?

You really have a question for iPhone support here, so I suggest that you post in the appropriate support area:
Using iPhone
The experts over there will likely suggest that you use the Apple Troubleshooting Guide for iOS devices, so you might want to work your way through that before you post in the iPhone support area.
http://support.apple.com/kb/TS1398

Why is Java VM on Win32 so slow??

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