optimize performance flutter maps

To optimize the load speed of OpenMapTiles in Flutter, you can use the following techniques:

1. Use a caching mechanism: You can use a caching mechanism to store the tiles locally on the device, so that they can be loaded faster the next time the user opens the app. The flutter_cache_manager package is a good option for this.

2. Use a smaller tile size: By default, OpenMapTiles uses 512x512 pixel tiles. However, you can use smaller tile sizes, such as 256x256 or 128x128 pixels, to reduce the amount of data that needs to be downloaded and improve the load speed.

3. Use a CDN: You can use a content delivery network (CDN) to serve the tiles from a server that is geographically closer to the user, reducing the latency and improving the load speed. Mapbox provides a CDN for OpenMapTiles.

4. Use a lower zoom level: If your app does not require high levels of detail, you can use a lower zoom level to reduce the number of tiles that need to be downloaded and improve the load speed.

Here's an example of how to implement these techniques in Flutter:

1. Use the flutter_cache_manager package to cache the tiles:

```dart
import 'package:flutter_cache_manager/flutter_cache_manager.dart';

final tileLayerOptions = TileLayerOptions(
  urlTemplate: 'https://api.mapbox.com/styles/v1/{id}/tiles/{z}/{x}/{y}?access_token={accessToken}',
  additionalOptions: {
    'accessToken': '<your_access_token>',
    'id': 'mapbox/streets-v11',
  },
  tileProvider: CachedNetworkTileProvider(
    cacheKey: 'openmaptiles',
    tileUrlTemplate: 'https://api.mapbox.com/styles/v1/{id}/tiles/{z}/{x}/{y}?access_token={accessToken}',
    additionalOptions: {
      'accessToken': '<your_access_token>',
      'id': 'mapbox/streets-v11',
    },
    maxAge: const Duration(days: 7),
    maxZoom: 16,
    cache: DefaultCacheManager(),
  ),
);
```

This will cache the tiles for 7 days and limit the maximum zoom level to 16.

2. Use a smaller tile size:

```dart
final tileLayerOptions = TileLayerOptions(
  urlTemplate: 'https://api.mapbox.com/styles/v1/{id}/tiles/{z}/{x}/{y}?access_token={accessToken}&tileSize=256',
  additionalOptions: {
    'accessToken': '<your_access_token>',
    'id': 'mapbox/streets-v11',
  },
);
```

This will use 256x256 pixel tiles instead of the default 512x512 pixel tiles.

3. Use a CDN:

```dart
final tileLayerOptions = TileLayerOptions(
  urlTemplate: 'https://api.mapbox.com/styles/v1/{id}/tiles/{z}/{x}/{y}?access_token={accessToken}&tileSize=256&cdn=mapbox',
  additionalOptions: {
    'accessToken': '<your_access_token>',
    'id': 'mapbox/streets-v11',
  },
);
```

This will use the Mapbox CDN to serve the tiles.

4. Use a lower zoom level:

```dart
final tileLayerOptions = TileLayerOptions(
  urlTemplate: 'https://api.mapbox.com/styles/v1/{id}/tiles/{z}/{x}/{y}?access_token={accessToken}&tileSize=256&cdn=mapbox&maxzoom=12',
  additionalOptions: {
    'accessToken': '<your_access_token>',
    'id': 'mapbox/streets-v11',
  },
);
```

This will limit the maximum zoom level to 12.