I love firefox.. my favorite browser.. and it's always been some what speedy to me.. but the 3.5 release just seems very slow and some what laggy(slow loading menu's, start up/exit). Has anyone else noticed things like this? Also I'm not running any Extensions.

Fine for me.

I've had this happen to me. It seems after a while, something happens, and the browser doesn't respond as quickly. I can close the browser and then continue on, and it'll be fine, but it's annoying when I've got windows open

Don't remember this happening before with 3.1

I've had no problems at all. It's sped up a little bit for me, but it was already bloody fast to begin with. On my computer and laptop, it's faster than Safari 4, and Google Chrome 3. Yes, I know the benchmarks say that Chrome is faster than Firefox, but not here!

I was on 3.0.11 and it was fine, never had an issue.

Since the use of RC3 (which is the same as final release), I only noticed Firefox speed improved by noticeable difference.

It loads a bit slowly for me..up to 20 secs, but works fine after.

I've been a happy Firefox user for years, and I've experienced this once before. For no apparent reason it just became slow and laggy. I had to create a new profile, which solved this issue for me.

On Windows partition - everything seems slow compared to Chrome, noticeably slower!

On Linux partition - Firefox 3.5 seems fine so far, plus it's not using Tracemonkey on my distro yet (x64) so it will only get faster.

Firefox has suddenly hung for a second or two. However, I don't know what's causing it, and it's only happened twice so far, the first when it was still labeled RC3.

At all other times though, it's been much faster than Firefox 3, so I'm pretty sure whatever the next few patches bring will fix the minor hang issue. But in the meantime, I'm considering just starting over with a, "Clean" install anyway.

I use to be a huge fan of Firefox but I'm just not liking 3.5. It seems slow for me as well.

I've been absolutely fine since beta 4 I think it was. Quick as can be.

What kind of computer are you running now?

lenovo laptop, intel dualcore t3400, 2gb of ram

3.5 is slow here too. Not a lot slower but it is noticeable.

I certainly don't know why they're claiming all these performance improvements and IE8 seems faster than Firefox at this stage.

Firefox can get laggy when the Places database (all your history, bookmarks, etc.) get too big. Mine's close to 100MB (this isn't the cache--this is history, bookmarks, etc.!); there's a world of difference when I start Firefox with a fresh profile (but with the same settings, extensions, etc.) than with my existing profile. Making sure that the places db is defragged helps a bit (b/c it's accessed and written to every time you hit a URL of any sort).

If you cut all the nice features Firefox has and other browsers don't, it would be very fast. Sorry, but absolutely nothing is perfect for everyone. Get used to it and stop bashing this wonderful piece of software with silly milliseconds comparisons. This is purely childish behavior.

Because for many of us, Firefox 3.5 has been much faster than it used to. I'm really curious as to how it's actually noticeably slower than usual for you guys. I've experienced nothing but good results on the number of computers I've installed it on, including those crappy $300 Compaqs.

I know it shouldn't matter at all either, considering I've upgraded from 3.0 -> 3.5 on a few of them as well, but have you tried a clean install?

Edit: Also, I run a number of addons, but that has never really slowed the performance at all.

Performance hasn't gotten worse for me, but I notice that memory usage is still crazy.

I have to agree. Not only is the initial loading a little slower, but the browsing experience seems sluggish.

Also, I've been having trouble loading my usernames and passwords from FF3.0.11.

And a lot of extensions that I use still don't work (yes, I've done the maxVersion trick and installed Nightly Tester Tools, but they just force the extensions to install, but it doesn't mean they'll work properly).

3.5=epic f4il.

Yeah, I've noticed. I was wondering why Firefox ran slowly... when I realized I had history entries dating back months ago

I didn't notice any slowdowns with Firefox 3.5
Firefox 3.5 + FlashPlayer + Adblock Plus (Green On This Site) + Foxit + Java + Quicktime + Windows??? (WTF)

After going to Chrome, Firefox feels bloated! 3.5 fixed some issues but Chrome still beats it by far. Once it gets dedicated extension support (the process to install adsweep is lengthy and complicated for your average user), and gets the ability to manage filetypes, it will be the best browser out there!

Firefox could learn a thing or two from Google, especially the idea of making each tab its own process so you don't crash all your tabs, but rather you can close that one and keep the remainder running

Because it is faster, if you're having slow downs the only things I can suggest are trying safe mode or a new profile.


Memory usage is pretty good for what it has to store, better than other browsers.

And if it doesn't use the memory, it's wasted.


You know IE also does the "process per tab" thing, right?

They are working on it though, sharing code with the Chrome guys (open source is nice that way)

Found this:



Also seems suggested to go to your IE options and clear your cache/temp files there too. Hope that helps.

I have to agree with that, it doesn't feel as snappy as Opera or IE8 for me. On the other hand it is faster for loading the pages so I don't know maybe it cancels that out.

I hate how Mozilla is moving aware form what Firefox was, barebones and very quick(compared to the competition). They keep ADDING things.

3.0.11 was absolutely fine for me. RC2 was slower on startup.
RC3/ 3.5 takes 20-30 seconds to startup now, sometimes it'll take over a minute.
Clearly something is wrong as even the World's Slowest Startup App (Adobe Lightroom) takes less than 15 seconds on my 3ghz pc.
I've tried un/reinstalling but same issue.
Not gonna waste my time trying to sort it out until I get Windows 7 (RC atm) but it's annoying as hell.

use CCleaner

For those with speed issues possibly on Vista/7:



Also seems suggested to go to your IE options and clear your cache/temp files there too. Hope that helps.

Repeating this since a few have said it has really helped them.

I don't have history enabled, I find Firefox to start within a few seconds on a cold boot (Windows 7). I've had problems which you have stated in the past, especially from 1.5 to 2. Erasing the profile and making a new one fixed this issue for me. Maybe you have an extension or your profile is corrupt or something?

Honestly, I can't tell any speed difference since v2 but I can't ditch it either because of the add-ons.

Does anyones Flash vidoes such as on youtube take a while to load up now on 3.5 and the begining 3/4seconds you just hear sound and then the video catches up. I would just say it was the video but it happens on pretty much all videos

Its fine for me.

Everything is fine for me. Memory usage is pretty good, better than IE8 that's for sure. IE8 is what I find to be a DOG of a browser. I swear it only takes a few days for IE8 to suddenly decide "hey, im gonna be slow from now on". It appears to load quick, but then it freezes for about 20 seconds or so before it will let me use it. This behavior is sporadic, though. IE8 also freezes when another tab is loading or when I right click. Firefox NEVER does this. I hope they focus on fixing such performance issues for IE9.

Have you tweaked your about:config?

If so, untweak it and try again.
If not, try tweaking it

Same here. It's performing slower for me. Hang ups, crashes. Hopefully the next update will fix these issues.

I disagree. If they added the multi-process support like the rest it would improve performance.

The startup of a vanilla Firefox with history/session-restore/cache emptied can be counted in seconds while the startup of Google Chrome with history/session-restore/cache full and crx extensions can be counted in milliseconds (on vista).

I also wish that Mozilla would improve the performance of what they have instead of adding more functionality. They will probably have to practically build it from the ground up though.

You mean multi-threading, right? Multi-process is one form of multi-threading. And a very expensive and inefficient form, at that, because you've got the extra memory overhead, the extra IPC costs (which are very expensive), etc. The only benefit that multi-process gives you over same-process multi-threading is that it limits the extent of damage if something goes wrong: if there's a crash, only a part of your browser would die instead of the entire browser. If you get a memory leak or fragmentation issues, only a part of your browser is affected. And from my personal experience of using Google Chrome, if it wasn't for multi-process to limit the extent of damage, Chrome would be in far worse shape than Firefox in both of those departments.

And Firefox does multiple threads for doing certain things, though not for everything (most notably, all the tabs are run on the same thread). Yea, this sucks, but it's on their to-do list.

And there is a huge tradeoff between feature set and performance here. For example, the Firefox Places database makes it possible for me to type in a fragment of a URL and a fragment of a page title into the location bar to find a URL in my history to go to; it's one of the things that I miss the most whenever I use Chrome. And guess what, keeping a history of all my browsing activity for the past several months (a places DB of ~100MB) is going to drag you down (which is evident if I delete the db). But I keep it because, in my opinion, the Smart Location Bar is one of the best features ever, and I personally couldn't live without it.

Or what about extensibility? What extensibility does Chrome offer? If you ever looked at Chrome's extension dev docs, you'd see that Chrome extensions are nothing more than glorified Greasemonkey scripts. They can never, ever approach the degree of extensibility that Firefox extensions can offer because Gecko is a true platform: there's the rendering engine, there's the JavaScript engine, and the Firefox browser itself is actually written in XML (XUL), driven by JavaScript, and styled using CSS, and all running on top of the Gecko engine. Is this the fastest way of doing things? Hell no. In fact, if you had to pick one thing about Firefox to blame for performance, it's that Gecko is a full-blown platform running XUL--not the weak multithreading. But it makes Firefox easier to develop (because, well, they don't have the kind of limitless resources that Google or MSFT have), it makes it easier to make Firefox cross-platform (available for Windows, Linux, Mac, Solaris, BeOS, OS/2, mobile phones, etc., while Google is still hammering away on their Linux and Mac versions). And most importantly for a lot of people, it makes it possible to write Firefox extensions that can do anything that the browser can do and that can alter any aspect of the browser. Chrome's extensions can't do that, and unless Google throws everything out the window and fundamentally reengineers everything, Chrome extensions will never be anything more than glorified Greasemonkey scripts.

Of course, different people value things differently, but for me personally, the price for Chrome's performance is way too high.

I didn't notice a slow down upgrading to 3.5, but i do wish it was as fast as Safari 4. the only reason i haven't switched over is because of stumbleupon.

Not laggy at all for me. Significantly faster than any previous version hands down.

It is due to chromes multi-process structure that if you open a JavaScript intensive tab, the browser itself does not stutter. Therefore it does have an impact on performance. This is particularly noticeable for me if I open, for example gmail, while I am doing other things or if I have a game in another tab. It may use more memory but it also increases security from using that extra memory too. Therefore, using a multi-process structure has both performance and security benefits whereas a multi-threaded structure only has performance benefits. A combination of both is ideal of-course.


We agree here.


Chrome already has the potential to do this. It would just require merging two search bars. Therefore that means it can be done without the trade off in performance that you imply is unavoidable.


Well apparently Greasemonkey can do a lot. They plan to support extensions like delicious toolbar, StumbleUpon, ad block, flashblock, download helpers/accelerators, flashgot, foxytunes, web of trust, forefastfox, etc. Sauce. Looking at the most downloaded Firefox extensions, I think that will satisfy the majority of users.

Also got the same on an XP SP3 system, FF 3.5 takes a tad longer to start up from cold, and clicking File > Exit isn't as instant as it used to be in previous versions, but web browsing speed is certainly more nippy in 3.5 however.

I haven't started a new profile and imported bookmarks, saved passwords, login auto-fill etc. that I find essential, whilst leaving the rest of the collected junk behind. I usually do that at every major release to keep the profile clean.

That is incorrect. You will get the same Gmail-won't-make-my-UI-stutter benefit with single-process multithreading, as you would with multiprocessing. The multithreading spotlight is often on high-performance parallel computing, but that sort of stuff is relatively rare; most of the time, multithreading is used for stuff like improving responsiveness. Mozilla's multithreading is limited and the JS all run in the same thread, but if that were to change, you would get the exact same benefit. I'm not saying that multiprocessing is necessarily bad, but that people should recognize it for what it is: a trade-off of performance (vs. a fully-implemented single-process multithreading scheme) for a limit to the extent of the effect of Bad Stuff. It offers nothing else beyond single-process multithreading. Period.


Well, yes, it is powerful. That's why content scripts are so popular. But there is more of a limit to what you can do.

So isn't my statement correct? Both provide performance increase while one also provides security. I think a multi-process structure is also much easier to implement. Seems like the logical thing to do.


Like what? I guess themes are the main problem.

Where does this extra security come from?

Nothing has been said about running the child processes in low integrity mode or anything, it's just been said they'll be more secure because they use more memory.

Oops, my apologies. I misread your "both" as "only".

As for the limitations, stuff that modify the UI and the function of the browser itself. E.g., stuff that add to the "page info" dialog, the many extensions that extend on or even completely re-implement Fx's tabbed browsing. Stuff that work with low-level traffic between the browser and sites. Etc.

Well, I meant Google Chrome's Sandbox method.


Seeing as the majority of people do not depend on such features, I think the trade off between speed and such features is acceptable. A Tab-Mix-Plus equivalent will be missed though I presume then. On the other hand, this is already being missed in firefox 3.5 lol. I do hope Google Chrome will add some more options on tab management built-in.

I find 3.5 using more memory. Has peaked at 500MB which is insane for a browser.

I'd totally agree. Firefox has never 'done' it for me.
Chrome though..... mmm!

noticeably slower than safari(in mac) - yes
reason enough to ditch it - no

why?

addons, favicons in bookmarks toolbar, one-click bookmarking and awesome bar

'nuf said