Filling fields with data on fly I have some records imported to my module tables. Some of this data is synchronized to drupal nodes by creating and updating existing nodes of specified type. This operation is made each time new import is done. The problem is, it produces around 60 000 nodes for every new import and it is quite a lot. Synchronization takes hours and operations through Views takes ages or crashes.

Is there any way to store my data only in my tables and serve them from this tables as nodes? Some way to only creates nodes with some properties set as language and title, and then provide data for fields directly from my tables?
If revisions aren't important you might want to fork your website codebase and try installing Field SQL NoRevisions module, by removing the "revisions" of Nodes node creation and fetching takes half the number of normal drupal queries.

Depending on you Read vs Write ratio you also might want to consider moving some of your Fields into a NoSQL database such as MongoDB.