realm-js: Performance Problems when working with large datasets

Goals

Our app allows users to sort the photos on their device in a unique way. This means they can’t just use the built in photos app to do the sorting.

As a result we have Photos and Albums. We store a URI to the photo and what albums the photo has been sorted to.

Expected Results

Writing 50 records should take less than a second.

Actual Results

If there are more than 5,000 records in the database, adding 50 more takes ~1 second. Since this is react native this absolutely kills the responsiveness of the app.

NOTE: This is definitely a release build, Android.

Steps to Reproduce

I’ll create a repro if necessary, just want to make sure this isn’t expected behaviour before I do.

Code Sample

export class Photo {
	static schema: ObjectSchema = {
		name: 'Photo',
		primaryKey: 'uri',
		properties: {
			timestamp: { type: 'date', indexed: true },
			uri: 'string',
			width: 'double',
			height: 'double',
			albums: 'Album[]',
			inTrash: { type: 'bool', default: false, indexed: true },
			lastSeenImportId: { type: 'string?', indexed: true },
		},
	};

	// ...
}

export class Album {
	static schema: ObjectSchema = {
		name: 'Album',
		primaryKey: 'id',
		properties: {
			id: 'string',
			name: 'string',
			photos: { type: 'linkingObjects', objectType: 'Photo', property: 'albums' },
		},
	};

	// ...
}

Version of Realm and Tooling

• Realm JS SDK Version: 2.29.2
• React Native: 0.59.10
• Client OS & Version: Android, all tested versions.
• Which debugger for React Native: None, Release build with console.log profiling.