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Currently, when opening attribute tables with a large number of features, QGIS 3.44 becomes very slow and sometimes unresponsive. This happens even on high-end hardware, which suggests the bottleneck is in how QGIS handles loading/displaying attributes.

It would be very helpful to have performance optimizations for large datasets, especially in workflows involving cadastral or assessor data, where layers often contain hundreds of thousands of features.

Even with 64 GB RAM, RTX 3050 GPU, and 1 TB SSD, attribute tables with many features take a long time to open, and scrolling/interaction becomes laggy.

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    Use the option "show features visible on map" docs.qgis.org/3.40/en/docs/user_manual/working_with_vector/…. Commented Sep 22 at 6:06
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    Performance of attribute table depends on how many object it has to show. Datasource and it's options, configuration etc. is also a very important thing. Where and in what format do you store the data? Is it a file format or a database table? Are any indexes configured? How many features do you have in this layer? Commented Sep 22 at 8:27
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    This reads more like an enhancement request than a Question. Please Edit the Question to state the exact storage format, exact feature counts, the average number of vertices per feature, the number of columns and average number of bytes per row, provide exact times, detail what steps you have taken to improve performance, and to ask a single question. For most formats, there is no such thing as an "attribute table", especially since the access model treats geometries as just another type of column in a table. Commented Sep 22 at 12:40

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