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As of this writing. This is the only combining plugin that works for all pages my website - a J2.5 site. Specifically there was an inline script for an upload button on a FoxContact form that all the other plugins kept rewriting. (even with the JS and clean/minify HTML disabled!?)
Anyhow for sites with multiple components and scripts this is the one to get.
It took a couple of hours to get working to maximum efficiency, I found the easiest way was to look at my source code, and combine the css in that order, as for the JS it was mootools-core, jquery.js then the rest as sourced. The htaccess based rewriting didn't work for me even though I use rewrites with other apps. No Biggie. It did what I wanted.

Joomla has such a wonderful variety of extensions that I, like I expect many others, tend to get carried away, ending up with a very complicated and SLOW website. After spending weeks on trying to optimize my site....and evaluating a number of similar extensions, I took a chance on JBetelo. Most tools that compress JS and CSS cause problems, but JBetelo working immediately. My YSlow score went from a 75 to an 80. I had already done a lot to fix problems with ETags, adding a CDN for a cookie-free domain, setting expires headers on my own, but JBetelo was the only way I found that I could compress JS and CSS (for the biggest impact on YSlow) without completely breaking my site. It's also the only such product I've found that can move JS to the bottom or remove wasted space in the HTML itself (left by inline scripting and CSS). Bottom line, I love this extension!!! Optimization is not for the weak-of-heart, but JBetelo makes it relatively easy to get a good improvement in site speed without too much effort.

amaze be light joomla, be increased score yslow, configure entity tags (etags), compress components with gzip, put css at top, put javascript at bottom, reduce cookie size and more~ thanks very very much~

The extension did speed up my site by a few points. Except selecting the option to merge css made all my background images disappear. The parameters in the plugin provide very little info on how to use each setting. I've contacted the developer through his website, who hasn't replied yet. Has anyone else experienced problems merging css with this plugin?

It works very well.
Merge JS/CSS file and can use "data" source in css.

Perfect!

Of all the plugins i have tried - this is the one i like the best.

I use it with YooTheme Templates - both 1.5 and 1.6 and it great.

This extension is Amazing with a capital 'A' once I figured out how to configure the settings according to my site's needs.

It managed to shave 5+ seconds off of the time to load my site. As a comparison, RokGzipper only managed to cut 2+ secs from the same site.

But just remember,
This extension is a tool, a great one, to help tune your site; not a magic wand you simply install and voila! everything's done.

Thank you for sharing this extension!

As a previous reviewer stated, i've tried many optimizers, but.... Until Jbetolo was put to the test on my site. Speedup acoording to Yslow was instant. I had to set some rules for de loading of css and jd files, but I think this was due to bad coding of te components concerned. The integration of Smush it is really a hit. All files in te correct directorys, so you only have to remove the smush addition 9when you use this method). My Yslow is now rated from C 72 to B 68 on the slowest page, and then only because I don't use CDN and I dont know how to lower HTTP request anny further.

The best plugin in its field an I'm looking forward to the first non Beta 2 release.

I have spent significant amount of time dealing with my site performance. As it is quite complex site, full of JavaScript and CSS, it was crucial for me to tune up - optimize site (google likes it, users too).
I played with CssJScompress, JHC, JFinalizer. JFinalizer was my favorite, but it was nightmare to setup and to have all optimization in place. So even it is great tool, not for my site. Today I explored Jbetolo and I can honestly tell you -> THIS IS ONE OF THE BEST IF NOT BEST. You have lot of options (and correct setup took me max 2h),possibility to omit sensitive JS, CS files which do not like to be minimized. I also like the fact that source code of website looks cleaner after optimization. I did not use options for CDN, smash service, but it is only +. What I would suggest to add is gzip (joomla system gzip do not work? At least for me) and css sprites (but I assume that this is not easy to integrate).
Jbetolo changed my score in webpagetest.org from 65 to 81! Yslow from D to C (75). And most important I can see that site loads faster.
It would be even better, but I have lot of JS files which do not like minification so I had to omit these from optimization.
Thank you for this great plugin! I recommend your inteligent plugin to everyone. I believe that in few months it will be the best rated plugin in Site Perfomance section. Bravo!

This little game combines merging/compressing CSS and JavaScript with the Smush.it lossless image optimization service. I moved from a PageSpeed score of 83 to 93, and then I am not counting the gains from smush.it or PHP minify. I did encounter a bug on one page, but it was squashed in about 10 minutes by the great support. I highly recommend using this plugin if you need a performance gain.

Before activating this extensions i had an average joomla site of Grade C with 64 Http Request.

On the joomla performance grader olmost all was in red except valid and gzip.

Now i get a Solid Grade A on small site and a Grade B 88 on Yslow.

The performance grader also list my entire site in green execpt 1 field in yellow, and Http request are down to 6 by joomla performance standard.

Html validates and that is not normal when usig other extensions.

The only part i did not get working so far is the CDN. But when site loads at under 1 sec, who even cares.

This is the extension to go with as far as i care.

This is a great extension with even better support. Just like all site optimization extensions, it involves quite a bit of tweaking until it works correctly. However, this one works very well right out of the box!

Every issue I had was solved directly by the developer though email correspondence! Support doesn't get much better than that. Not only did he fix it but he told me how he did it so I know what to do int he future.

I have used numerous extensions to try and get my load times down and had no luck until now. This is by far the VERY BEST extension I have used! Thank you for all of your hard work!

I like it! This plug-in works well and with less configuring than others I have tried. Simple and elegant. Thank you!

This plugin do work well for one of my sites but for another where I have an iframe loading external content it messes up the entire page. The iframe isn't loaded and the template breaks.

I decided to use this plugin after i saw writings of developer at different forums. And how much enthusiasm was behind his work.

And i did´t do mistake.
I had some problems to get plugin to work at my Joomla configuration and developer first tried with admin login to fix it. Then he asked for complete backup of my root folder and DB, and he fixed problem for a half of day at home. I won´t mention that he answer emails directly fast.

Beleive me, with this developer you wont stay in deep water when you move to Joomla 1.6. Or when you install some plugin that is poorly coded and has to work with merge-minify plugin.

Apsolutely doesn´t matter if this plugin will stay free in future. Support is excellent. Even more excellent with fact that it is a free plugin.

Try to put yourselves in his shoes. How many of you would bother to aks someone (you don´t know) for joomla root folder, DB, install that at home and troubleshoot? All for free.

I may say, in Joomla world it is excellent support.

As other people are mentioning before me they have tried other solutions but often ran into problems. jbetolo does the job without any problems and I manged to solve many of the issues that left me with problems before. Thanks for a great extension managed to get a grade A ranking with this extension.

This is my very first review on Joomla Extensions Directory. I have registered on JED especially to review this extension. I have tested all extensions on Site Performance category, but Jbetolo performed the best for me. It has all the features to boost the speed of a Joomla site. It can merge, minify and compress all JS and CSS files in a single file. And have lots of other options to control the behaviour of the extension. I can't stop myself to recommend this extension to everyone. You can check the difference by using YSlow. It has boosted my YSlow points from 56 to 87. Support from Gobezu(Author) via email is also very superb. So, give it is try guys. You will surely thanks me :) and Gobezu.

The module is well weighted! It works fine and speeded up or web appr. by 50%! Thanks for this great work!

Because of the way Joomla is setup and the way various modules work, it creates inherent inefficiencies. This extension does exactly what it advertises. It has easily increased my site performance by at least 75%.
because every web site is different, it is possible that you may run into minor snags, but do contact the developer 9Gobezu and he'll help you sort it out.
I had tried numerous different ways to do what this extension does to no avail. This is a GREAT extension, supported by a developer who is responsive.
Thanks Ray