Currently, using Realm in a scenario which require a lot of calls through the C++/JS boundary (i.e. in a tight loop), can totally kill the performance of an app.

We did some tests and for example, just accessing something like

results[0].myprop

was >200x slower with Realm objects than normal JS array of objects (which you'd get after running a query on other databases).

Some possible solutions:

• Graal.js in theory could help with that, but it seems that node extensions are not optimized at this point
• Automatic caching of retrieved data (datomic does something similar)
• Using something like JSON.parse(JSON.stringify(results)) instead of realm collections and objects - slow and ugly, last-resort hack