I've a dashboard on the web and want to show it on a screen. So I'm thinking about making a portable kiosk style webclient on raspberry pi with raspberrian.
What browser where you using? Google Chrome, even though it's pretty big, tends to perform better with those kind of webpages than other smaller browsers, especially if those pages run for a longer time.
I also overclocked to 1GHZ and gave more ram to the graphics unit.
Try to measure, what is really needed by the page. Animated charts tend to use CPU/GPU(depending on what kind of chart, how it is implemented and what kind of acceleration the browser supports), but the Script powering the chart could use a lot of RAM, in which case the performance would drop because of the low-memory situation, not the CPU. I set up a kios-mode website like this once and one problem was RAM. The easiest solution, though not the prettiest, was to reload the whole browser or the browser tab so the leaked memory the JS engine produced was freed and could be reused.
Does somebody have tipps on how to improve the performance ? Or would it be a better choise to switch to an other SingleBoard Computer with more GPU / CPU / RAM ?
Of course another Computer with better specs would be the easier choice. The Raspberry Pi is performing pretty slow compared to other computers and depending on how much time you can spend on optimizing your page, it might be worth buying something like a CubieTruck.