Ho T Monitor will highlight units clearly that have your own active Heal over Time spells.
Debuff Highlighting in standard debuff colours on all friendly frames.
Nymbia's Perl used to do a lot of crazy full frame udpates all over the place, eating away at CPU cycles.
This was all fixed to only update what was necessary based on events.
3D Portraits for player, pet, target, focus, party. Of course this may degrade your framerate somewhat because you are displaying more 3D character models that without this option. Red and Green combat flashes for frames when player, pet, target, party, partypets, raid take damage/heals. Added time left on party member/target buffs/debuffs when in a raid, these depend somewhat on CTRA/o RA/o RA2 sending appropriate information over the addon channel, although some of it can be determined at run time by X-Perl, when a player gets a buff for example, we know how long it should last, and therefor when it should expire.
Totally new options window including all X-Perl options and access via minimap icon. Including class coloured names, and configurable reaction colours.
Includes everyone in raid, so you don't have to work out who doesn't have items, it'll list them with 0 instead of no entry.
Lua Profiler/On Event mods used extensively and regularly to ensure that X-Perl does not do more work than is absolutely necessary.So, for example, when a single UNIT_HEALTH update is fired, then just a single raid frame or party frame etc.gets the event, rather than 40 raid frame's handlers, 4 party and so on.And of course, most often outside of raids they are never required and are never created.Raid Target icon support for Target, Target's Target, MT Targets.