Weird, I have very little problems with Firefox on macos. I had performance issues with Chrome for big tables. Firefox was sluggish, but Chrome took 30s to render it (about 3000 rows, 300 columns). I ended up writing something that displays a small view of the table using absolute positioned divs which depend on the scroll bar. Now it works smoothly on all browsers (including some older tablet). It was not a simple workaround, though.

Orion is also webkit, but buggy, isn't it? I don't care for it.