Pixlr is the creator of online cloud-based image tools. Today we have two applications in out suite, one we call Image Editor and the other is Photo Express. It is built in Flash and you need to have a Flash plug in (get flash) to get it to work.
Pixlr is built for non-professionals, the users that have basic editing needs. It's not for large RAW images or for printing. It is merely a tool for editing web images to be posted on blogs, news-sites, social networks like Facebook, Myspace Bebo, image sites like Flickr, Fotolog, Photobucket etc.
Since it is Flash based the question about how it runs is up to what kind of computer you have. If it is lagging you can try to shut down other web pages that might be running flash ads or close other software on your computer that is taking a lot of CPU.
To get the image into the application the file must first be uploaded to our server and then downloaded into the application. The file that was uploaded is automatically deleted from our servers after 5 minutes. The changes that you do to the image in the application never leaves your screen. If you use Flash 10 then there is no need for upload and the image is opened direct in your browser
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