Sample class descriptors in YAML

channel-energy.template.yml

template: channel-energy
elems:
  - field: channel-energy--type
    type: choice
    options:
      - id: heal
        name: "Heal"
      - id: harm
        name: "Harm"
  - hr
  - calc:
      field: channel-energy--per-day
      label: 
    equals:
      - number: 3
      - field: CHA
  - field: channel-energy--today
    type: checkgrid
    position: right
    max: 10

cleric.class.yml

class: cleric
name: cleric

skill-proficiency:
  - acrobatics
  - athletics
  - crafting
  - deception
  - diplomacy
  - intimidation
  - performance
  - society
  - stealth
  - thievery
armour-proficiency:
  - light
  - medium

options:
  - option: cleric-feats
    type: feat
    list: cleric
    count: 10
  - option: cleric-domain
    type: domain
    list: cleric
    count: 1

inc:
  - page: cleric

  - at: cleric:narrow:top
    elems:
      - class-title: "Cleric"
      - p: "of"
      - template: deity

  - at: cleric:wide:bottom
    section: "Cleric Feats"
    elems:
      - template: feats-list
        using: cleric-feats
      - zone: cleric:feats

  - feature: cleric-domains
    inc:
      - at: cleric:narrow:top
        elems:
          - section: "Domains"
          - zone: cleric:domains
          - each: cleric-domain
            template: domain

  - feature: cleric-spells
    enable:
      - subsystem:spells
      - subsystem:spell-points
    inc:
      - at: cleric:narrow
        section: "Spells"
        template: spellbox
        style: prepared
        max: 10
      - at: cleric:wide
        position: top
        elems:
          - section: "Cantrips"
            template: spells-list
            style: prepared
            level: 0
            count: 10
          - section: "Prepared Spells"
            template: spells-list
            style: prepared
            level: 10
            count: 3
          - zone: cleric:spells

deity.template.yml

template: deity
elems:
  - field: deity
    label: "Deity"
    type: text
    wide: true
  - template: alignment-grid
    position: right
  - hr
  - field: anathema
    label: "Anathema"
    type: text
    lines: 3

domain.template.yml

template: domain
params:
  - id
elems:
  - field: {{id}}--name
    label: "Domain"
    type: text
    wide: true
  - field: {{id}}--favored-weapon
    label: "Favored Weapon"
    type: text
    wide: true
  - hr
  - template: feats-list
    id: {{id}}--powers

rogue.class.yml

class: rogue
name: "Rogue"

skill-proficiency:
  - acrobatics
  - athletics
  - crafting
  - deception
  - diplomacy
  - intimidation
  - performance
  - society
  - stealth
  - thievery
armour-proficiency:
  - light
  - medium
weapon-proficiency:
  - martial

options:
  - id: rogue-feats
    type: feat
    list: rogue
    max: 10

inc:
  - page: rogue

  - at: rogue:narrow
    position: top
    elems:
      - class-title: "Rogue"
      - section: "Rogue"
        primary: true
        elems:
          - table: ...

  - at: rogue:wide:bottom
    elems:
      - zone: rogue:feats
      - section: "Rogue Feats"
        template: feats-list
        using: rogue-feats

  - feature: sneak-attack
    inc:
      - at: rogue-narrow
        section: "Sneak Attack"
        elems:
          - template: sneak-attack
          - zone: rogue:sneak-attack

  - feature: delibitating-strike
    level: 9
    inc:
      - at: rogue-sneak-attack
        subsection: "Debilitating Strike"
        elems:
          - p: "Entangle of enfeeble foes on a successful sneak attack."
          - field: delibitating-strike--conditions
            label: "Conditions"
            count: 5
            wide: true

  - feature: rogue-master-strike
    level: 19
    inc:
      - at: rogue:narrow
        section: "Master Strike"
        elems:
          - p: "..."

sneak-attack.template.yml

template: sneak-attack
elems:
  - p: "Add precision damage when striking a flat-footed foe."
  - calc:
      field: rogue-sneak-attack--d6
      label: "Sneak Attack Damage"
      epithet: "d6"
    equals:
      - divide:
          - field: rogue-level
            label: "Rogue Level"
        by: 3
      - hook: sneak-attack-damage
      - field: misc
        label: "Misc"

spell-school.enum.yml

enum: spell-school
type: text
items:
  - Abjuration
  - Conjuration
  - Divination
  - Enchantment
  - Evocation
  - Illusion
  - Necromancy
  - Transmutation

wizard.class.yml

class: wizard
name: "Wizard"

enable:
  - subsystem:spells
  - subsystem:spell-points

options:
  - type: feat
    list: rogue
    max: 10

inc:
  - page: wizard 

  - at: wizard:narrow
    position: top
    class-title: "Wizard"

  - at: wizard:wide:bottom
    section: "Wizard Feats"
    template: feats-list
    using: wizard-feats

  - feature: spell-schools
    inc:
      - at: wixatrd
        section: "Spell School"
        primary: true
        elems:
          - field: preferred-spell-school
            label: "Preferred Spell School"
            type: enum
            options: spell-school
            wide: true
            primary: true
          - field: forbidden-spell-school
            label: "Forbidden Spell School"
            type: enum
            options: spell-school
            wide: true

  - feature: wizard-spells
    inc:
      - at: wizard:narrow
        section: "Spells"
        template: spellbox
        key-ability: INT
        max-level: 10

      - at: wizard:wide
        elems:
          - section: "Cantrips"
            template: spellbox
            level: 0
            count: 10
          - section: "Prepared Spells"
            template: spellbox
            max-level: 10
            count: 3

While I am a not a programmer but wanting to learn, I see this as you can setup templates for each sections and reuse them, right?

What is the time based difference between this and what you are doing for PF1?