From 6e08de8878c07e331bb24ed68fadae849b0543d6 Mon Sep 17 00:00:00 2001
From: Oliwia Rogala <oliwia.rogala@smartbear.com>
Date: Mon, 24 Nov 2025 12:45:19 +0100
Subject: [PATCH 1/3] perf(ls): add cache for linting rules

---
 .../src/services/validation/validation-service.ts     | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/packages/apidom-ls/src/services/validation/validation-service.ts b/packages/apidom-ls/src/services/validation/validation-service.ts
index 71810b648..e2d19c5b8 100644
--- a/packages/apidom-ls/src/services/validation/validation-service.ts
+++ b/packages/apidom-ls/src/services/validation/validation-service.ts
@@ -74,6 +74,8 @@ export class DefaultValidationService implements ValidationService {
 
   private quickFixesMap: Record<string, QuickFixData[]> = {};
 
+  private lintingRulesSemanticCache: Map<string, LinterMeta[]> = new Map();
+
   public constructor() {
     this.validationEnabled = true;
     this.commentSeverity = undefined;
@@ -143,6 +145,12 @@ export class DefaultValidationService implements ValidationService {
   }
 
   private getLintingRulesSemantic(doc: Element, symbol: string, docNs: string): LinterMeta[] {
+    const cacheKey = `${docNs}-${symbol}`;
+
+    if (this.lintingRulesSemanticCache.has(cacheKey)) {
+      return this.lintingRulesSemanticCache.get(cacheKey)!;
+    }
+
     let meta: LinterMeta[] = [];
     const elementMeta = toValue(doc.meta.get('metadataMap')?.get(symbol)?.get('lint'));
     if (elementMeta) {
@@ -152,10 +160,12 @@ export class DefaultValidationService implements ValidationService {
     // get namespace rules with `given` populated as array
     try {
       if (!this.settings?.metadata?.rules) {
+        this.lintingRulesSemanticCache.set(cacheKey, meta);
         return meta;
       }
       const rules = this.settings?.metadata?.rules;
       if (!rules[docNs]?.lint) {
+        this.lintingRulesSemanticCache.set(cacheKey, meta);
         return meta;
       }
       meta = meta.concat(
@@ -179,6 +189,7 @@ export class DefaultValidationService implements ValidationService {
     } catch (e) {
       console.log('error in retrieving semantic rules', e);
     }
+    this.lintingRulesSemanticCache.set(cacheKey, meta);
     return meta;
   }
 

From 0bf526180c1af5ccc2464c681946470618e34de3 Mon Sep 17 00:00:00 2001
From: Oliwia Rogala <oliwia.rogala@smartbear.com>
Date: Mon, 24 Nov 2025 12:59:01 +0100
Subject: [PATCH 2/3] refactor: use defined const

---
 .../src/services/validation/validation-service.ts         | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/packages/apidom-ls/src/services/validation/validation-service.ts b/packages/apidom-ls/src/services/validation/validation-service.ts
index e2d19c5b8..f4fe402a1 100644
--- a/packages/apidom-ls/src/services/validation/validation-service.ts
+++ b/packages/apidom-ls/src/services/validation/validation-service.ts
@@ -159,15 +159,13 @@ export class DefaultValidationService implements ValidationService {
     }
     // get namespace rules with `given` populated as array
     try {
-      if (!this.settings?.metadata?.rules) {
-        this.lintingRulesSemanticCache.set(cacheKey, meta);
-        return meta;
-      }
       const rules = this.settings?.metadata?.rules;
-      if (!rules[docNs]?.lint) {
+
+      if (!rules || !rules[docNs]?.lint) {
         this.lintingRulesSemanticCache.set(cacheKey, meta);
         return meta;
       }
+
       meta = meta.concat(
         rules[docNs]!.lint!.filter((r) => {
           const matchesArray =

From 588f48a9ac95ec05ac626258f86fb6164f1abe81 Mon Sep 17 00:00:00 2001
From: Oliwia Rogala <oliwia.rogala@smartbear.com>
Date: Mon, 24 Nov 2025 13:26:02 +0100
Subject: [PATCH 3/3] refactor: set cache after function call

---
 .../apidom-ls/src/services/validation/validation-service.ts    | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/packages/apidom-ls/src/services/validation/validation-service.ts b/packages/apidom-ls/src/services/validation/validation-service.ts
index f4fe402a1..e0a2ef3df 100644
--- a/packages/apidom-ls/src/services/validation/validation-service.ts
+++ b/packages/apidom-ls/src/services/validation/validation-service.ts
@@ -162,7 +162,6 @@ export class DefaultValidationService implements ValidationService {
       const rules = this.settings?.metadata?.rules;
 
       if (!rules || !rules[docNs]?.lint) {
-        this.lintingRulesSemanticCache.set(cacheKey, meta);
         return meta;
       }
 
@@ -187,7 +186,6 @@ export class DefaultValidationService implements ValidationService {
     } catch (e) {
       console.log('error in retrieving semantic rules', e);
     }
-    this.lintingRulesSemanticCache.set(cacheKey, meta);
     return meta;
   }
 
@@ -691,6 +689,7 @@ export class DefaultValidationService implements ValidationService {
         set.forEach((s) => {
           // get linter meta from meta
           const semanticLintingRules = this.getLintingRulesSemantic(api, s, docNs);
+          this.lintingRulesSemanticCache.set(`${docNs}-${s}`, semanticLintingRules);
           if (semanticLintingRules && semanticLintingRules.length > 0) {
             for (const meta of semanticLintingRules) {
               this.processRule(