Fix bug: performance degrades over time

Signed-off-by: Kirill Enykeev <enykeev@gmail.com>
Fix bug: hard-coded periods

Signed-off-by: Kirill Enykeev <enykeev@gmail.com>
Fix bug: total memory equals free

Signed-off-by: Kirill Enykeev <enykeev@gmail.com>
Feature: write sample data location to the console log at start

Signed-off-by: Kirill Enykeev <enykeev@gmail.com>
Fix bug: Ugly jump on navigation from dashboard to details

Signed-off-by: Kirill Enykeev <enykeev@gmail.com>