Chat Lag Fix

// A simplified view of the code.
private static final long BLOCKLIST_REQUEST_COOLDOWN = 120;
private Instant nextRequest;
private final blockList Set;

// This method is called when receiving a chat message
public boolean isBlockedPlayer(UUID playerID) {
    // If we don't have the blocklist yet, fetch it
    // Note that when there's an error, fetchBlockList returns null
    //
    if (this.blockList == null) {
        this.blockList = fetchBlockList();
        // If we still don't have it, assume the player is not blocked
        if (this.blockList == null) {
            return false;
        }
    }
    return this.blockList.contains(playerID);
}
public Set fetchBlockList() {
    // Only check at least every 2 minutes.
    // This is why the lagspike only occurs every 2 minutes or later
    if (this.nextRequest == null || Instant.now().isAfter(this.nextRequest)) {
        return null;
    }
    // Reset the 2 minute timer
    this.nextRequest = Instant.now().plusSeconds(BLOCKLIST_REQUEST_COOLDOWN);
    try {
        // Make the HTTP request
        BlockListResponse response = minecraftClient.get(routeBlocklist, BlockListResponse.class);
        return response.getBlockedProfiles();
    } catch (/* exception */) {
        // If there's an error return null
        return null;
    }
}