I've got a fairly hefty Examine index setup in ExamineSettings.config - which normally has 400 fields with around 10000 entries at a time - as follows:

        <add name="ExternalTestIndexer" type="Examine.LuceneEngine.Providers.SimpleDataIndexer, Examine" 
             dataService="TestProj.Core.Services.Examine.TestIndexer, TestProj.Core"  
             analyzer="Lucene.Net.Analysis.WhitespaceAnalyzer, Lucene.Net" 
             directoryFactory="Examine.LuceneEngine.Directories.SyncTempEnvDirectoryFactory,Examine"
             indexTypes="ExternalTest"/>

which is using a simple data indexer with GetAllData to take values from a SQL query and push them into my Examine index. When a user uploads a CSV (which is fairly large - around 7000 rows of data), this data is first written to SQL, then the IndexAll action is called afterward:

            var indexer = ExamineManager.Instance.IndexProviderCollection[IndexConstants.ExternalTestIndexer];
            indexer.IndexAll(IndexConstants.ExternalTestIndexType);

At this point, the index is repopulated correctly. However, afterwards the site becomes very slow, with page response times taking up to 1/2 minutes. There's no hardware bottlenecks, and eDTU usage in Azure hovers around 40%. Have done all instructions posted here and I'm still seeing this issue - is it due to the size of the index potentially? Or something else I'm missing? Thanks.