A Path of Exile 2 build can feel comfortable through entire maps, then run dry halfway through a boss encounter. Before spending POE 2 Orbs on replacements, identify what changes when the fight lasts longer. Treat the problem as a resource budget: how much mana enters, how much leaves, and which actions actually earn their cost.

Find the Point Where Sustain Breaks

Record one extended attempt. Note your starting mana, time until the first forced pause, flask uses, and skills used immediately before the shortage. Separate uninterrupted attacking from movement and boss immunity phases so different conditions do not distort the comparison.

Then test your main damage skill without the full rotation. If mana still falls rapidly, investigate its cost and frequency. If it remains comfortable, add secondary skills individually. This isolates an expensive setup action instead of blaming the entire build.

Separate Cost From Frequency

Read the displayed cost after changing supports. Support gems can carry cost multipliers, so compare the finished skill rather than assuming another damage support has no resource consequence. Use the values shown in your current client.

Estimate spending by multiplying mana per use by uses per second. A hypothetical skill costing 40 mana, used five times each second, spends 200 mana per second before secondary actions. Test a different support separately from any attack or cast speed adjustment; otherwise, you cannot tell which change helped.

Audit Recovery and Rotation Timing

Write down the conditions attached to each recovery source. Ask whether it works against a lone target, during movement, and while you cannot connect attacks. For any recovery tied to kills, test the encounter without assuming additional enemies will appear.

Next, examine your timing. Are you refreshing an effect well before it expires, casting into an untargetable boss, or repeating a setup that already did its job Remove one redundant action, then compare mana remaining and damage delivered over the same interval.

Measure Damage Across the Whole Fight

Consider a simplified test: your main skill spends 120 mana per second, recovery supplies 140, and an unnecessary secondary cast costs 60 every two seconds. Total spending reaches 150, creating a deficit. Removing those repeated casts leaves the main skill sustainable under these assumptions.

Adding another offensive modifier would not resolve that deficit. Keeping attacks available can produce more total damage than a stronger burst followed by forced waiting. Compare equal attack windows, repeat attempts, and preserve major defenses while testing smaller recovery or cost adjustments.

Fix the measured cause before rebuilding everything. If you later consider POE 2 Orbs for sale, first decide which specific improvement your tests justify, rather than replacing effective gear blindly.