Investigate chunk per time handling

[Roman Simakov]

The main idea of tile processing is remove function call overhead. The main idea of pipeline processing is to save CPU cache. Now we have array of chunks of tiles of items. If we remove tile and will process chunk per time instead of tile per time we can make life much easy. We need to find evidence that it's possible to find such chunk size which save CPU cache, remove function call overhead and did not provide big metadata size overhead. Small chunk size will increase storage header size.