Performance Tweaks

Here are some tricks/settings to increase the performance of your bot:

Disabling Startup Wait

By default, Javacord waits for all servers and members being loaded on startup. You can disable this behavior in the DiscordApiBuilder before logging in:

new DiscordApiBuilder()
    .setToken("abc")
    .setWaitForServersOnStartup(false)
    .login()
    .thenAccept(api -> {
        // Do something
    }).exceptionally(ExceptionLogger.get());

Depending on the size of your bot, this can significantly speed up the login process. This comes with one downside however: The api.getServers() collection is empty directly after logging in. You will receive ServerBecomesAvailableEvents for every server which finished loading.

Fine Tuning the Message Cache

In order to reduce memory usage, you can completely disable the message cache or reduce the number of cached messages. By default, Javacord caches up to 50 messages per channel and removes messages from cache which are older than 12 hours. You can lower this limit by using DiscordApi#setMessageCacheSize(Capacity, StorageTimeInSeconds)

// Cache a maximum of 10 messages per channel for and remove messages older than 1 hour
api.setMessageCacheSize(10, 60*60);

You can even set this limit on a per-channel basis:

TextChannel channel = ...;
channel.getMessageCache().setCapacity(10);
channel.getMessageCache().setStorageTimeInSeconds(60*60);

Using the Updater classes

If you update several settings of an entity (server, channel, …) at once, you should use the updater for this entity instead of the updateXyz(...) methods.

Example

// Sends 1 request to Discord
ServerTextChannel channel = ...;
new ServerTextChannelUpdater(channel)
    .setName("example-channel")
    .setTopic("This is an example channel")
    .setNsfwFlag(true)
    .update();

instead of

// Sends 3 requests to Discord
ServerTextChannel channel = ...;
channel.updateName("example-channel");
channel.updateTopic("This is an example channel");
channel.updateNsfwFlag(true);


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