I suspect your custom rules might be causing the slowdown.
The only "rule" I have is a basic column coloring rule, and I noticed a slight jerkiness when scrolling through books since I added it, although I don't know if that's the culprit because I made several other modifications to my library at the same time.
If the number of items in the Tag Browser is the problem, you might consider trying to find a way to consolidate your columns. I've found that a single tag-like field set up as a hierarchy can replace several fields; just use the field name as the top level of the hierarchy. e.g. instead of a "Genre" field with the value "Mystery" in it, you could have a field with the value "Genre.Mystery".
Likewise, if you have several Yes/No columns with mutually exclusive values, you could consolidate them into a single field with a fixed set of permitted values. If the values aren't mutually exclusive, you could still turn them into a single tag-like column.
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