ROBERT  I'm pretty amazed at the performance of this on my iBook (900MHz G3, 10.4.11).

Developers of any eye-candy sort of app are quick to drop support for 10.4... but G3? Wow. It is totally usable and useful on it, it actually saves time if you do Google image searches and the like.

(I, too, had tried PicLens, and wasn't so impressed with it at that time.)  
(Version 1.9.1.17582)

STORMCHILD  This is brutally bad software. Not long after installing it, Safari slowed to a crawl and started beachballing, and shortly thereafter, all my other apps started to lock up, until I completely lost control of my machine. Couldn't even SSH in from another box. Eventually I had no choice but to force it to reset.

Since it's an Input Manager plugin, it quickly infects every program you launch after installing it. I ended up having to do a second forced reset soon after the first one. And there is NO UNINSTALLER and no instructions for uninstalling it either. You have to find all of the files it sprayed all over your system and remove them all manually. And then you have to reboot -- again -- before you can actually remove the files from the trash.

Awful, awful, awful. Stay away from this junk.  
(Version 1.8.3.14080)

ROOSTER  I used this when it was called PicLens on the PC. I really liked it and never had any problems with it. Along with their other product CoolPreviews it was great. I tried them both out in FireFox on a couple of my Macs and found them to be OK but I really wanted to use Safari and development/stability seemed to be a bit off in Safari. The last version of CoolIris (aka PicLens) was right on in Safari...it beat the heck out of browsing through pages of Google thumbnails looking for pictures and having to wait for another page to load and have a look at the picture. This is a great add-on to any browser and OS combo. it could use a little more user control/configuration but the concept is solid and a real improvement from an end-ser experience perspective. I have read of few of the other comments and I agree that i don't like the fact that it relies on input managers...for Safari...but is that the fault of the developer or the lack of an integrated plugin system in Safari to allow for feature expansion? I don't know! I think it fairly good and petty stable. blah...blah...blah :-)  
(Version 1.8.5.15841)

RPPHOTO  My machine became unstable too. Was a nightmare and took hours out of my workday. I noticed someone is "marking down" the comments with this problem. Must be the developer.  
(Version 1.8.5.14750)

LTOMKO  I too have had problems with CoolIris seeming to create a runaway process. To remove the software go to /Macintosh HD/Library/InputManagers and remove the folder with CoolIris in the name. Also go to /Macintosh HD/Library/Internet Plug-Ins and remove the WebKit plugin with the name CoolIris in it. Substitute the name of your system hard drive for "Macintosh HD". You will have to do this from an admin account or put in an admin account name and password when asked for one in a dialog box. Reboot after doing this.  
(Version 1.8.5.14750)

CREAGB  Same problem as Stormchild. High-end iMac with plenty of memory. After installation it ran wonderfully for about 5 minutes, then massive destruction. Machine was completely unusable. No uninstaller. Like a trojan horse. Looks great. Deadly. I have lost two days so far trying to get this off of my machine. Nothing on developer site to suggest knowledge that this is a problem.

Symptom: Machine will be running fine, then almost instantly grind to a glacial pace. And I mean glacial. Ten minutes for a click to register. A hard restart is the only apparent way out. Simple uninstall of plugin does nothing and no documentation on how to back out.

Advice greatly appreciated.  
(Version 1.8.3.14080)

RORO01  Amazing !!!

A must have! Works perfectly. Many thanks to the developer. The equivalent for Firefox is the Add-on called PicLens.  
(Version 1.8.0.4278)

ZX  So when is this going to work??? Crashes every browser within minutes! Super High CPU!.And more...

Please just make a simple Desktop-App!  
(Version 1.11)

ZO219  Cool Iris has been the cause of frequent Safari crashes, both this release and previous Safari. Unfortunately. It's gorgeous. Tested my plugins (others are Glims and SafariStand) and this is the culprit.

This has been going on, then, for a while. I'm surprised dev hasn't picked up on this by now. Until it improves, cannot use.  
(Version 1.9.0.16396)

ERIC  Be careful with plug ins ... and any app that interlaces with any apple app ... because this is where you can run into problems with conflicts on updates.

Safari quit working for me after an update and it took me 3 weeks to figure it is was a conflict with piclens. As soon as I removed it ... bingo ... back to normal.

Not saying this isn't a good app ... but be warned.  
(Version 1.9.0.16396)