diff --git a/models/issues/comment_list.go b/models/issues/comment_list.go
index 61ac1c8f562..c483ada75aa 100644
--- a/models/issues/comment_list.go
+++ b/models/issues/comment_list.go
@@ -26,14 +26,14 @@ func (comments CommentList) LoadPosters(ctx context.Context) error {
 		return c.PosterID, c.Poster == nil && c.PosterID > 0
 	})
 
-	posterMaps, err := getPostersByIDs(ctx, posterIDs)
+	posterMaps, err := user_model.GetUsersMapByIDs(ctx, posterIDs)
 	if err != nil {
 		return err
 	}
 
 	for _, comment := range comments {
 		if comment.Poster == nil {
-			comment.Poster = getPoster(comment.PosterID, posterMaps)
+			comment.Poster = user_model.GetPossibleUserFromMap(comment.PosterID, posterMaps)
 		}
 	}
 	return nil
@@ -41,7 +41,7 @@ func (comments CommentList) LoadPosters(ctx context.Context) error {
 
 func (comments CommentList) getLabelIDs() []int64 {
 	return container.FilterSlice(comments, func(comment *Comment) (int64, bool) {
-		return comment.LabelID, comment.LabelID > 0
+		return comment.LabelID, comment.LabelID > 0 && comment.Label == nil
 	})
 }
 
@@ -51,6 +51,9 @@ func (comments CommentList) loadLabels(ctx context.Context) error {
 	}
 
 	labelIDs := comments.getLabelIDs()
+	if len(labelIDs) == 0 {
+		return nil
+	}
 	commentLabels := make(map[int64]*Label, len(labelIDs))
 	left := len(labelIDs)
 	for left > 0 {
@@ -118,8 +121,8 @@ func (comments CommentList) loadMilestones(ctx context.Context) error {
 		milestoneIDs = milestoneIDs[limit:]
 	}
 
-	for _, issue := range comments {
-		issue.Milestone = milestoneMaps[issue.MilestoneID]
+	for _, comment := range comments {
+		comment.Milestone = milestoneMaps[comment.MilestoneID]
 	}
 	return nil
 }
@@ -175,6 +178,9 @@ func (comments CommentList) loadAssignees(ctx context.Context) error {
 	}
 
 	assigneeIDs := comments.getAssigneeIDs()
+	if len(assigneeIDs) == 0 {
+		return nil
+	}
 	assignees := make(map[int64]*user_model.User, len(assigneeIDs))
 	left := len(assigneeIDs)
 	for left > 0 {
@@ -301,6 +307,9 @@ func (comments CommentList) loadDependentIssues(ctx context.Context) error {
 
 	e := db.GetEngine(ctx)
 	issueIDs := comments.getDependentIssueIDs()
+	if len(issueIDs) == 0 {
+		return nil
+	}
 	issues := make(map[int64]*Issue, len(issueIDs))
 	left := len(issueIDs)
 	for left > 0 {
@@ -427,6 +436,9 @@ func (comments CommentList) loadReviews(ctx context.Context) error {
 	}
 
 	reviewIDs := comments.getReviewIDs()
+	if len(reviewIDs) == 0 {
+		return nil
+	}
 	reviews := make(map[int64]*Review, len(reviewIDs))
 	if err := db.GetEngine(ctx).In("id", reviewIDs).Find(&reviews); err != nil {
 		return err
diff --git a/models/issues/issue.go b/models/issues/issue.go
index 1777fbb6a68..564a9fb8359 100644
--- a/models/issues/issue.go
+++ b/models/issues/issue.go
@@ -238,6 +238,9 @@ func (issue *Issue) loadCommentsByType(ctx context.Context, tp CommentType) (err
 		IssueID: issue.ID,
 		Type:    tp,
 	})
+	for _, comment := range issue.Comments {
+		comment.Issue = issue
+	}
 	return err
 }
 
diff --git a/models/issues/issue_list.go b/models/issues/issue_list.go
index 22a4548adc2..02fd330f0a7 100644
--- a/models/issues/issue_list.go
+++ b/models/issues/issue_list.go
@@ -81,53 +81,19 @@ func (issues IssueList) LoadPosters(ctx context.Context) error {
 		return issue.PosterID, issue.Poster == nil && issue.PosterID > 0
 	})
 
-	posterMaps, err := getPostersByIDs(ctx, posterIDs)
+	posterMaps, err := user_model.GetUsersMapByIDs(ctx, posterIDs)
 	if err != nil {
 		return err
 	}
 
 	for _, issue := range issues {
 		if issue.Poster == nil {
-			issue.Poster = getPoster(issue.PosterID, posterMaps)
+			issue.Poster = user_model.GetPossibleUserFromMap(issue.PosterID, posterMaps)
 		}
 	}
 	return nil
 }
 
-func getPostersByIDs(ctx context.Context, posterIDs []int64) (map[int64]*user_model.User, error) {
-	posterMaps := make(map[int64]*user_model.User, len(posterIDs))
-	left := len(posterIDs)
-	for left > 0 {
-		limit := db.DefaultMaxInSize
-		if left < limit {
-			limit = left
-		}
-		err := db.GetEngine(ctx).
-			In("id", posterIDs[:limit]).
-			Find(&posterMaps)
-		if err != nil {
-			return nil, err
-		}
-		left -= limit
-		posterIDs = posterIDs[limit:]
-	}
-	return posterMaps, nil
-}
-
-func getPoster(posterID int64, posterMaps map[int64]*user_model.User) *user_model.User {
-	if posterID == user_model.ActionsUserID {
-		return user_model.NewActionsUser()
-	}
-	if posterID <= 0 {
-		return nil
-	}
-	poster, ok := posterMaps[posterID]
-	if !ok {
-		return user_model.NewGhostUser()
-	}
-	return poster
-}
-
 func (issues IssueList) getIssueIDs() []int64 {
 	ids := make([]int64, 0, len(issues))
 	for _, issue := range issues {
diff --git a/models/user/user_list.go b/models/user/user_list.go
new file mode 100644
index 00000000000..c66d59f0d92
--- /dev/null
+++ b/models/user/user_list.go
@@ -0,0 +1,47 @@
+// Copyright 2025 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package user
+
+import (
+	"context"
+
+	"code.gitea.io/gitea/models/db"
+)
+
+func GetUsersMapByIDs(ctx context.Context, userIDs []int64) (map[int64]*User, error) {
+	userMaps := make(map[int64]*User, len(userIDs))
+	left := len(userIDs)
+	for left > 0 {
+		limit := db.DefaultMaxInSize
+		if left < limit {
+			limit = left
+		}
+		err := db.GetEngine(ctx).
+			In("id", userIDs[:limit]).
+			Find(&userMaps)
+		if err != nil {
+			return nil, err
+		}
+		left -= limit
+		userIDs = userIDs[limit:]
+	}
+	return userMaps, nil
+}
+
+func GetPossibleUserFromMap(userID int64, usererMaps map[int64]*User) *User {
+	switch userID {
+	case GhostUserID:
+		return NewGhostUser()
+	case ActionsUserID:
+		return NewActionsUser()
+	case 0:
+		return nil
+	default:
+		user, ok := usererMaps[userID]
+		if !ok {
+			return NewGhostUser()
+		}
+		return user
+	}
+}
diff --git a/routers/web/repo/issue_view.go b/routers/web/repo/issue_view.go
index 61e75e211bd..aa49d2e1e86 100644
--- a/routers/web/repo/issue_view.go
+++ b/routers/web/repo/issue_view.go
@@ -40,16 +40,30 @@ import (
 )
 
 // roleDescriptor returns the role descriptor for a comment in/with the given repo, poster and issue
-func roleDescriptor(ctx stdCtx.Context, repo *repo_model.Repository, poster *user_model.User, issue *issues_model.Issue, hasOriginalAuthor bool) (issues_model.RoleDescriptor, error) {
+func roleDescriptor(ctx stdCtx.Context, repo *repo_model.Repository, poster *user_model.User, permsCache map[int64]access_model.Permission, issue *issues_model.Issue, hasOriginalAuthor bool) (issues_model.RoleDescriptor, error) {
 	roleDescriptor := issues_model.RoleDescriptor{}
 
 	if hasOriginalAuthor {
 		return roleDescriptor, nil
 	}
 
-	perm, err := access_model.GetUserRepoPermission(ctx, repo, poster)
-	if err != nil {
-		return roleDescriptor, err
+	var perm access_model.Permission
+	var err error
+	if permsCache != nil {
+		var ok bool
+		perm, ok = permsCache[poster.ID]
+		if !ok {
+			perm, err = access_model.GetUserRepoPermission(ctx, repo, poster)
+			if err != nil {
+				return roleDescriptor, err
+			}
+		}
+		permsCache[poster.ID] = perm
+	} else {
+		perm, err = access_model.GetUserRepoPermission(ctx, repo, poster)
+		if err != nil {
+			return roleDescriptor, err
+		}
 	}
 
 	// If the poster is the actual poster of the issue, enable Poster role.
@@ -576,6 +590,8 @@ func prepareIssueViewCommentsAndSidebarParticipants(ctx *context.Context, issue
 		return
 	}
 
+	permCache := make(map[int64]access_model.Permission)
+
 	for _, comment = range issue.Comments {
 		comment.Issue = issue
 
@@ -593,7 +609,7 @@ func prepareIssueViewCommentsAndSidebarParticipants(ctx *context.Context, issue
 				continue
 			}
 
-			comment.ShowRole, err = roleDescriptor(ctx, issue.Repo, comment.Poster, issue, comment.HasOriginalAuthor())
+			comment.ShowRole, err = roleDescriptor(ctx, issue.Repo, comment.Poster, permCache, issue, comment.HasOriginalAuthor())
 			if err != nil {
 				ctx.ServerError("roleDescriptor", err)
 				return
@@ -691,7 +707,7 @@ func prepareIssueViewCommentsAndSidebarParticipants(ctx *context.Context, issue
 							continue
 						}
 
-						c.ShowRole, err = roleDescriptor(ctx, issue.Repo, c.Poster, issue, c.HasOriginalAuthor())
+						c.ShowRole, err = roleDescriptor(ctx, issue.Repo, c.Poster, permCache, issue, c.HasOriginalAuthor())
 						if err != nil {
 							ctx.ServerError("roleDescriptor", err)
 							return
@@ -940,7 +956,7 @@ func prepareIssueViewContent(ctx *context.Context, issue *issues_model.Issue) {
 		ctx.ServerError("RenderString", err)
 		return
 	}
-	if issue.ShowRole, err = roleDescriptor(ctx, issue.Repo, issue.Poster, issue, issue.HasOriginalAuthor()); err != nil {
+	if issue.ShowRole, err = roleDescriptor(ctx, issue.Repo, issue.Poster, nil, issue, issue.HasOriginalAuthor()); err != nil {
 		ctx.ServerError("roleDescriptor", err)
 		return
 	}