TBotNS doesn't become faster paced or more action packed later. If anything, it becomes more challenging since book requires reader to remember the details and

TBotNS doesn't become faster paced or more action packed later. If anything, it becomes more challenging since book requires reader to remember the details and actively seek solutions to puzzles the texts presents. However, you and your tastes in literature might have changed since 80s so you could give those first 100 or so pages a try to see if your perception of them changed.