diff --git a/publicodes/source/mecanisms/variations.ts b/publicodes/source/mecanisms/variations.ts
index a61176c46..16478264a 100644
--- a/publicodes/source/mecanisms/variations.ts
+++ b/publicodes/source/mecanisms/variations.ts
@@ -63,7 +63,7 @@ export default function parseVariations(v, context): VariationNode {
 	}
 }
 
-const evaluate: EvaluationFunction<'variations'> = function (node) {
+const evaluate: evaluationFunction<'variations'> = function (node) {
 	const [temporalValue, explanation, unit] = node.explanation.reduce<
 		[
 			Temporal<any>,
@@ -164,6 +164,7 @@ const evaluate: EvaluationFunction<'variations'> = function (node) {
 			[]
 		)
 	)
+
 	return {
 		...node,
 		nodeValue,
diff --git a/publicodes/source/replacement.tsx b/publicodes/source/replacement.tsx
index 4aef93352..21a90e786 100644
--- a/publicodes/source/replacement.tsx
+++ b/publicodes/source/replacement.tsx
@@ -16,8 +16,22 @@ export type ReplacementRule = {
 	whiteListedNames: Array<ASTNode & { nodeKind: 'reference' }>
 	rawNode: any
 	blackListedNames: Array<ASTNode & { nodeKind: 'reference' }>
+	remplacementRuleId: number
 }
 
+// Replacements depend on the context and their evaluation implies using
+// "variations" node everywhere there is a reference to the original rule.
+// However for performance reason we want to mutualize identical "variations"
+// nodes instead of duplicating them, to avoid wasteful computations.
+//
+// The implementation works by first attributing an identifier for each
+// replacementRule. We then use this identifier to create a cache key that
+// represent the combinaison of applicables replacements for a given reference.
+// For example if replacements 12, 13 et 643 are applicable we use the key
+// `12-13-643` as the cache identifier in the `inlineReplacements` function.
+let remplacementRuleId = 0
+const cache = {}
+
 export function parseReplacements(
 	replacements: Rule['remplace'],
 	context: Context
@@ -51,6 +65,7 @@ export function parseReplacements(
 			replacementNode,
 			whiteListedNames,
 			blackListedNames,
+			remplacementRuleId: remplacementRuleId++,
 		} as ReplacementRule
 	})
 }
@@ -166,7 +181,11 @@ ${applicableReplacements.map(
 		)
 	}
 
-	return {
+	const applicableReplacementsCacheKey = applicableReplacements
+		.map((n) => n.remplacementRuleId)
+		.join('-')
+
+	cache[applicableReplacementsCacheKey] ??= {
 		nodeKind: 'variations',
 		visualisationKind: 'replacement',
 		rawNode: node.rawNode,
@@ -181,4 +200,5 @@ ${applicableReplacements.map(
 			},
 		],
 	}
+	return cache[applicableReplacementsCacheKey]
 }