what is the most suitable time interval for updating information on a block while mining the block
Miners do optimize the block construction process internally.

Unfortunately they do not share this information with the community, so we don't know what methods they use, how they choose TX's and how they distribute work to pool participants.

Both mining machines and mining software the big miners use are secret. Modern ASIC machines' hardware are closed source and so is their firmware and operating system.

This is unfortunate considering that Satoshi gave us Bitcoin source code, which is absolutely revolutionary, for free.