qooxdoo 3.5 I'm using qx.ui.table.Table and want to set my own header renderers. In small tables this doesn't make problems but with more columns the setting process slows down exponentially, because on every change of a renderer all the existing header cells are updated. The updates seems to go like this small example: 1 1-2 1-2-3 1-2-3-4 So, after adding 4 header renderers we wait for the 10th time. If the table contains more columns (in my case 200) the pyramid will grow and the wait time grows much faster. I think this is a problem of internal used events. Wouldn't it be good to have a beginUpdate- and an endUpdate-function? After calling beginUpdate there are no table updates and with calling endUpdate a complete table refresh will be done. This would help to create bigger tables fast.
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