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Yes, it could be your computer. You can easily test this: record a bag file and play is back on a very much lower rate. SLAM in 3D does need some power.
It could also be that your problem is very hard. SLAM needs some features to match where it is. A flat wall doesn't have many. Also an error of 5cm doesn't seem much to me. Maybe your expectations are different from what the algorithms can deliver.
It might be a good idea to upload an image of the environment and/or a specific bag file that you want solved. Maybe someone has time to look at that. With the information you have given it is a bit hard to guess what is the actual problem.
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