I found CHILDREN OF TIME slow going to begin with. I disliked the first chapter (but this is in fact normal as the point of view character, Dr Avrana Kern, is deliberately quite antipathetic) and put the book down for a while before trying again. Finally, the book was a very rewarding read, so I advise anyone with doubts at the beginning to persist.
The plot takes a while to pick up but I found the later social and technological evolution of the spiders interesting and enjoyable. There was a real attempt to imagine how the very different subjectivity of the intelligent Spiders could evolve and progress in similar but not identical ways towards greater civilization, despite their “uplift” being due to an accident.
The parallel plot of the decadence and devolution of the humans provided a predictable but satisfying counterpoint.
The imagination of a biology-based technology was well done, but it had the defect of biological determinism. Humans are glorified monkeys genetically lacking in empathy, and so biologically doomed as a species to self-extermination, unless some sort of ethical, as opposed to cognitive, uplift can occur.
This speculative premise recalls that of Octavia Butler’s XENOGENESIS TRILOGY, and the Spiders with their genetic technology recall the Oankali, except that their encounter with the Other is not driven by trade but by their capacity for empathy.