[Help] Lag at login

Hello ladies and gentlemen!
I am fairly new at coding, but I decided to tackle a simple name-plugin as a donator perk on my server, but recently I noticed a lot of lag was occuring at login. I'm not completely sure, but considering I use an onPlayerJoin, and I'm certainly capable of making mistakes, I will assume it is my plugin causing it. This is the code in question:

Code:java

    @EventHandler
    public void onPlayerJoin(PlayerJoinEvent e){
        if(e.getPlayer().getName() != null){
            Player player = e.getPlayer();
            if(this.getConfig().get(player.getName() + "prefix") != null && this.getConfig().get(player.getName() + "colour") != null && this.getConfig().get(player.getName() + "suffix") != null){
                player.setDisplayName("&r" + this.getConfig().getString(player.getName() + "prefix") + this.getConfig().getString(player.getName() + "colour") + player.getName() + "&r" + this.getConfig().getString(player.getName() + "suffix"));
            }
            //prefix null
            else if(this.getConfig().get(player.getName() + "prefix") == null && this.getConfig().get(player.getName() + "colour") != null && this.getConfig().get(player.getName() + "suffix") != null){
                player.setDisplayName(this.getConfig().getString(player.getName() + "colour") + player.getName() + "&r" + this.getConfig().getString(player.getName() + "suffix"));
            }
            //colour is null
            else if(this.getConfig().get(player.getName() + "prefix") != null && this.getConfig().get(player.getName() + "colour") == null && this.getConfig().get(player.getName() + "suffix") != null){
                player.setDisplayName("&r" + this.getConfig().getString(player.getName() + "prefix") + player.getName() + "&r" + this.getConfig().getString(player.getName() + "suffix"));
            }
            //suffix is null
            else if(this.getConfig().get(player.getName() + "prefix") != null && this.getConfig().get(player.getName() + "colour") != null && this.getConfig().get(player.getName() + "suffix") == null){
                player.setDisplayName("&r" + this.getConfig().getString(player.getName() + "prefix") + this.getConfig().getString(player.getName() + "colour") + player.getName());
            }
            //prefix and colour is null
            else if(this.getConfig().get(player.getName() + "prefix") == null && this.getConfig().get(player.getName() + "colour") == null && this.getConfig().get(player.getName() + "suffix") != null){
                player.setDisplayName(player.getName() + "&r" + this.getConfig().getString(player.getName() + "suffix"));
            }
            //prefix and suffix is null
            else if(this.getConfig().get(player.getName() + "prefix") == null && this.getConfig().get(player.getName() + "colour") != null && this.getConfig().get(player.getName() + "suffix") == null){
                player.setDisplayName(this.getConfig().getString(player.getName() + "colour") + player.getName());
            }
            //colour and suffix is null
            else if(this.getConfig().get(player.getName() + "prefix") != null && this.getConfig().get(player.getName() + "colour") == null && this.getConfig().get(player.getName() + "suffix") == null){
                player.setDisplayName("&r" + this.getConfig().getString(player.getName() + "prefix") + player.getName());
            }
 
        }
    }

Basically, what the plugin does is it gives the people who have the permission the ability to change the colour of their name, and add a few letters before and after. I use this blurb of jambled coding mess to set their display name at login, and what it does is checks to see if the player has a prefix, suffix, or colour, and what to do accordingly.

 

Try assigning a variable to the string you get from the config so you only have to access the config once.
String prefix = this.getConfig.getString(player.getName() + "prefix"); Also do it for the suffix and colour.

Then just replace everywhere that this.getConfig.getString(player.getName() + "prefix") is with prefix. And do it for the other ones to.