This belongs in the openlayers-user group. Vector layers with large nos of vertices do not well as you have found because the drawing has to be done is JS. You will get far better performance if you use WMS for display and WFS for query. (eg http://openlayers.org/dev/examples/getfeature-wfs.html). For more advanced queries, create the protocol as per example from WMS, and use it for queries. This was discussed recently (and often) in the user mailing list. You may even have a case for using WMS-T.
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