Sure the very first time you run a query. But with multi tiered caching the data you frequently access sits closer and closer to the gpus so that alleviates that bottlekneck over time to an extent. Also what is a fantastic way of improving i/o? Compression and decompression. Our own file format compresses and decompresses using the GPU. We are working on doing the same for some of the Parquet decompression steps. I/O is almost always your main concern here, but you can improve upon it greatly by leverage processes that might not have been computationally feasible before.