Ganyu's Burst is the main damage source in Freeze teams, therefore Charged Attacks should only be used when the time between using the teams Skills and Bursts allows it. If running Shenhe alongside Ganyu, weapons with CRIT Rate / CRIT DMG stats and/or DMG% are slightly favored.
With (4), it is best to aim close to but not above 45% CRIT Rate.
Regarding Weapon Choices:
Polar Star: This weapon is much harder to optimize with, due to having a very high CRIT Rate stat.
Amos' Bow: In quickswap heavy rotations (Ganyu Mona Venti Diona) where you usually don't do a lot of Charged Attacks, this weapon performs worse than the other 5 star options listed.
Song of Stillness: Ranking assumed Ganyu receives healing before casting her Burst.
Prototype Crescent: Requires a weak spot hit before casting Ganyu's Burst to utilize the passive fully. At [R5], this weapon peforms close to .
Mouun's Moon: This weapon's exact performance varies with the teams total Burst cost. At [R5], this weapon performs similar to .
Regarding Artifact Choices:
Sets
Marechaussee Hunter (4): This set should only be used with Furina on the team and performs only slightly worse than (4).
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Indicates important notes at the bottom of the page.
Ganyu's Level 2 Charged Attack applies two instances Cryo as they do not share the same ICD, which allows you to trigger Melt reaction twice for both damage instances. Charged Attack will be the majority of her damage output while neglecting her Skill/Burst damage contribution for most scenarios.
Ganyu's Burst should not be used in most Melt teams, as it can lead to Charged Attacks not being able to trigger Melt.
Regarding Weapon Choices:
Amos' Bow: Ganyu's Level 2 Charged Attack Bloom extends arrow flight duration allowing her to get 3 stacks of passive even on point blank range.
Flower-Wreathed Feathers: This weapon scales incredibly well with refinements. At [R5], this weapon performs better than .
Hamayumi: Due to its passive, this weapon prefers (4) instead. At higher refinements, can outperform and .
Scion of the Blazing Sun: At [R5], this weapon can outperform and .
Prototype Crescent: At higher refinement levels with good uptime on its passive, it can potentially be on par with . However, do bear in mind that not all enemies have weak spots that you can headshot, which does affect its performance significantly.
Regarding Artifact Choices:
Sets
Shimenawa's Reminiscence (4): If you are able to squeeze 5 Charged Attacks during the 10 second buff duration, (4) pulls ahead of (4). Due to it being very difficult to do, (4) will usually end up dealing more damage for most players.
Unfinished Reverie (4): If Ganyu is played in a team with consistent Burning uptime, this set performs better than (4) and (4).
Regarding Talent Choices:
Burst: Ganyu's Burst is low priority on a Melt Build since most of the times, you don't cast her Burst at all so that it doesn't steal your Melt reaction.
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Indicates important notes at the bottom of the page.
Mono Cryo Ganyu teams utilize (4) and Cryo Resonance while having Ganyu on field dealing damage through both her Charged Attacks and Burst.
When using (4), Ganyu reaches max CRIT Rate with a base of 45% on her Charged Attacks and a base of 65% on her Burst. Anything between 45% and 55% CRIT Rate is a nice point to be at without sacrificing too much damage on either end.
Regarding Weapon Choices:
Amos' Bow: If Shenhe is present on the team, this weapon performs worse than .
Song of Stillness: Ranking assumed Ganyu receives healing before casting her Burst.
Flower-Wreathed Feathers: This weapon scales incredibly well with refinements. At [R5], this weapon performs closer to .
Prototype Crescent: Requires a weak spot hit before casting Ganyu's Burst to utilize the passive fully. At [R5], this weapon peforms sligthly better (without Shenhe) or slightly worse (with Shenhe) than .
Mouun's Moon: This weapon's exact performance varies with the teams total Burst cost. Performs better than similar options with Shenhe present on the team.