Invention blueprint cheese. Easy 99 on dxp if you have the herblore levels for extreme invention pots, and at least 70+ invention. Takes about an hour to do 70->99, and costs almost nothing.

[Meatshield72]

https://runescape.wiki/w/Discovery#Blueprints
So, as your invention level increases you get access to more and more blueprints.
Thing is, boosted levels work for unlocks, and an extreme inv pot boosts by +17, effectively allowing you to do all of the blueprints up to 17 levels above your actual level.
This interaction is useful during dxp, because blueprint xp is doubled, and so unlike with the normal xp rates, +17 levels worth of blueprints can give enough xp/levels to get you to the next set of blueprints.
As an example, if you started with 75 inv, the pot will boost you to 92, allowing you to do all the blueprints from 75-92. If you have dxp, pulse cores, clan citadel boost, torstol incense, etc. (all of the xp boosts you have), doing all of those blueprints at perfect quality will give enough xp to get you to 85 (almost 86). Potting again with your new level boosts you to 102, allowing you to do all of the blueprints from 92-102, which is enough xp to get you to 93 or so and then you can boost to 110, rinse and repeat till you don't have any more blueprints available after potting.

Do note that it is *extremely* important to get perfect on everything. Lower quality gives less xp, and as such can reduce how far the compounding level gains+boosts can take you by disproportionate amounts. If you get good quality instead of perfect then you only go from 75->83->90 instead of 75->85->93.
Even if it takes you twice as long to do perfects, it's worth it. Blueprints can only ever be done once, so it's best to get as much out of that one go as possible.

[Wolf]

noted

[Chancefat]

Thats a great tip