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Excellent - delighted to hear you've found the cause of the problem. It's probably not going to affect many people as badly as it affected me, because I have the very worst combination of factors: a large book library, and a VERY slow device with little RAM. As I noted in an earlier post, the performance of 3.4.2 on my Nexus 7 (a much, much faster CPU and a lot more RAM) is absolutely fine, with grouping nodes opening instantly.
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