diff --git a/pkg/hicli/html.go b/pkg/hicli/html.go
index 569549c..b6b2b21 100644
--- a/pkg/hicli/html.go
+++ b/pkg/hicli/html.go
@@ -505,9 +505,12 @@ func getCodeBlockLanguage(token html.Token) string {
 	return ""
 }
 
+const builderPreallocBuffer = 100
+
 func sanitizeAndLinkifyHTML(body string) (string, []id.ContentURI, error) {
 	tz := html.NewTokenizer(strings.NewReader(body))
 	var built strings.Builder
+	built.Grow(len(body) + builderPreallocBuffer)
 	var codeBlock *strings.Builder
 	var codeBlockLanguage string
 	var inlineImages []id.ContentURI
diff --git a/pkg/hicli/sync.go b/pkg/hicli/sync.go
index 953fd4c..467d996 100644
--- a/pkg/hicli/sync.go
+++ b/pkg/hicli/sync.go
@@ -384,6 +384,7 @@ func (h *HiClient) calculateLocalContent(ctx context.Context, dbEvt *database.Ev
 			}
 		} else {
 			var builder strings.Builder
+			builder.Grow(len(content.Body) + builderPreallocBuffer)
 			linkifyAndWriteBytes(&builder, []byte(content.Body))
 			sanitizedHTML = builder.String()
 			wasPlaintext = true