diff --git a/packages/process-explorer-worker/src/parts/GetAttributionName/GetAttributionName.ts b/packages/process-explorer-worker/src/parts/GetAttributionName/GetAttributionName.ts
new file mode 100644
index 0000000..2a19178
--- /dev/null
+++ b/packages/process-explorer-worker/src/parts/GetAttributionName/GetAttributionName.ts
@@ -0,0 +1,11 @@
+import type { MemoryAttribution } from '../MemoryAttribution/MemoryAttribution.ts'
+import * as GetUrlName from '../GetUrlName/GetUrlName.ts'
+
+export const getAttributionName = (attribution: MemoryAttribution): string => {
+  const scope = attribution.scope || 'memory'
+  const url = attribution.url ? GetUrlName.getUrlName(attribution.url) : ''
+  if (url) {
+    return `${scope}: ${url}`
+  }
+  return scope
+}
diff --git a/packages/process-explorer-worker/src/parts/GetBreakdownName/GetBreakdownName.ts b/packages/process-explorer-worker/src/parts/GetBreakdownName/GetBreakdownName.ts
new file mode 100644
index 0000000..a831f5d
--- /dev/null
+++ b/packages/process-explorer-worker/src/parts/GetBreakdownName/GetBreakdownName.ts
@@ -0,0 +1,17 @@
+import type { MemoryBreakdownEntry } from '../MemoryBreakdownEntry/MemoryBreakdownEntry.ts'
+import * as GetAttributionName from '../GetAttributionName/GetAttributionName.ts'
+
+export const getBreakdownName = (
+  entry: MemoryBreakdownEntry,
+  index: number,
+): string => {
+  if (entry.attribution && entry.attribution.length > 0) {
+    return entry.attribution
+      .map(GetAttributionName.getAttributionName)
+      .join(', ')
+  }
+  if (entry.types && entry.types.length > 0) {
+    return entry.types.join(', ')
+  }
+  return `breakdown ${index + 1}`
+}
diff --git a/packages/process-explorer-worker/src/parts/GetFrontendMemoryUsage/GetFrontendMemoryUsage.ts b/packages/process-explorer-worker/src/parts/GetFrontendMemoryUsage/GetFrontendMemoryUsage.ts
index 8bbabef..08456d0 100644
--- a/packages/process-explorer-worker/src/parts/GetFrontendMemoryUsage/GetFrontendMemoryUsage.ts
+++ b/packages/process-explorer-worker/src/parts/GetFrontendMemoryUsage/GetFrontendMemoryUsage.ts
@@ -1,116 +1,34 @@
 import type { ProcessInfo } from '../ProcessInfo/ProcessInfo.ts'
-
-interface MemoryAttribution {
-  readonly scope?: string
-  readonly url?: string
-}
-
-interface MemoryBreakdownEntry {
-  readonly attribution?: readonly MemoryAttribution[]
-  readonly bytes: number
-  readonly types?: readonly string[]
-}
-
-interface MemoryMeasurement {
-  readonly breakdown?: readonly MemoryBreakdownEntry[]
-  readonly bytes: number
-}
-
-interface PerformanceWithMemory extends Performance {
-  readonly measureUserAgentSpecificMemory?: () => Promise<MemoryMeasurement>
-}
-
-const WindowPid = -1
-
-const QueryOrHashRegex = /[?#]/
-
-const isValidMemoryValue = (value: unknown): value is number => {
-  return typeof value === 'number' && Number.isFinite(value) && value >= 0
-}
-
-const getMeasureMemory = (): (() => Promise<MemoryMeasurement>) | undefined => {
-  const { measureUserAgentSpecificMemory } =
-    performance as PerformanceWithMemory
-  if (typeof measureUserAgentSpecificMemory !== 'function') {
-    return undefined
-  }
-  return measureUserAgentSpecificMemory.bind(performance)
-}
-
-const getUrlName = (url: string): string => {
-  if (!url || url === 'cross-origin-url') {
-    return url
-  }
-  try {
-    const parsed = new URL(url)
-    const parts = parsed.pathname.split('/').filter(Boolean)
-    return parts.at(-1) || parsed.hostname || url
-  } catch {
-    const withoutQuery = url.split(QueryOrHashRegex, 1)[0]
-    const parts = withoutQuery.split('/').filter(Boolean)
-    return parts.at(-1) || url
-  }
-}
-
-const getAttributionName = (attribution: MemoryAttribution): string => {
-  const scope = attribution.scope || 'memory'
-  const url = attribution.url ? getUrlName(attribution.url) : ''
-  if (url) {
-    return `${scope}: ${url}`
-  }
-  return scope
-}
-
-const getBreakdownName = (
-  entry: MemoryBreakdownEntry,
-  index: number,
-): string => {
-  if (entry.attribution && entry.attribution.length > 0) {
-    return entry.attribution.map(getAttributionName).join(', ')
-  }
-  if (entry.types && entry.types.length > 0) {
-    return entry.types.join(', ')
-  }
-  return `breakdown ${index + 1}`
-}
-
-const toBreakdownProcess = (
-  entry: MemoryBreakdownEntry,
-  index: number,
-): ProcessInfo => {
-  const name = getBreakdownName(entry, index)
-  return {
-    cmd: name,
-    memory: entry.bytes,
-    name,
-    pid: -2 - index,
-    ppid: WindowPid,
-    synthetic: true,
-  }
-}
+import * as GetMeasureMemory from '../GetMeasureMemory/GetMeasureMemory.ts'
+import * as IsValidMemoryValue from '../IsValidMemoryValue/IsValidMemoryValue.ts'
+import * as ToBreakdownProcess from '../ToBreakdownProcess/ToBreakdownProcess.ts'
+import * as WindowPid from '../WindowPid/WindowPid.ts'
 
 export const getFrontendMemoryUsage = async (
   rootPid: number,
 ): Promise<readonly ProcessInfo[]> => {
-  const measureMemory = getMeasureMemory()
+  const measureMemory = GetMeasureMemory.getMeasureMemory()
   if (!measureMemory) {
     return []
   }
   try {
     const measurement = await measureMemory()
-    if (!isValidMemoryValue(measurement.bytes)) {
+    if (!IsValidMemoryValue.isValidMemoryValue(measurement.bytes)) {
       return []
     }
     const breakdown = measurement.breakdown || []
     const breakdownProcesses = breakdown
-      .filter((entry) => isValidMemoryValue(entry.bytes) && entry.bytes > 0)
-      .map(toBreakdownProcess)
+      .filter(
+        (entry) =>
+          IsValidMemoryValue.isValidMemoryValue(entry.bytes) && entry.bytes > 0,
+      )
+      .map(ToBreakdownProcess.toBreakdownProcess)
     return [
       {
         cmd: 'window',
         memory: measurement.bytes,
         name: 'window',
-        pid: WindowPid,
+        pid: WindowPid.WindowPid,
         ppid: rootPid,
         synthetic: true,
       },
diff --git a/packages/process-explorer-worker/src/parts/GetMeasureMemory/GetMeasureMemory.ts b/packages/process-explorer-worker/src/parts/GetMeasureMemory/GetMeasureMemory.ts
new file mode 100644
index 0000000..a7433e7
--- /dev/null
+++ b/packages/process-explorer-worker/src/parts/GetMeasureMemory/GetMeasureMemory.ts
@@ -0,0 +1,12 @@
+import type { MemoryMeasurement } from '../MemoryMeasurement/MemoryMeasurement.ts'
+import type { PerformanceWithMemory } from '../PerformanceWithMemory/PerformanceWithMemory.ts'
+
+export const getMeasureMemory = ():
+  (() => Promise<MemoryMeasurement>) | undefined => {
+  const { measureUserAgentSpecificMemory } =
+    performance as PerformanceWithMemory
+  if (typeof measureUserAgentSpecificMemory !== 'function') {
+    return undefined
+  }
+  return measureUserAgentSpecificMemory.bind(performance)
+}
diff --git a/packages/process-explorer-worker/src/parts/GetUrlName/GetUrlName.ts b/packages/process-explorer-worker/src/parts/GetUrlName/GetUrlName.ts
new file mode 100644
index 0000000..8cef045
--- /dev/null
+++ b/packages/process-explorer-worker/src/parts/GetUrlName/GetUrlName.ts
@@ -0,0 +1,16 @@
+const QueryOrHashRegex = /[?#]/
+
+export const getUrlName = (url: string): string => {
+  if (!url || url === 'cross-origin-url') {
+    return url
+  }
+  try {
+    const parsed = new URL(url)
+    const parts = parsed.pathname.split('/').filter(Boolean)
+    return parts.at(-1) || parsed.hostname || url
+  } catch {
+    const withoutQuery = url.split(QueryOrHashRegex, 1)[0]
+    const parts = withoutQuery.split('/').filter(Boolean)
+    return parts.at(-1) || url
+  }
+}
diff --git a/packages/process-explorer-worker/src/parts/IsValidMemoryValue/IsValidMemoryValue.ts b/packages/process-explorer-worker/src/parts/IsValidMemoryValue/IsValidMemoryValue.ts
new file mode 100644
index 0000000..16948b9
--- /dev/null
+++ b/packages/process-explorer-worker/src/parts/IsValidMemoryValue/IsValidMemoryValue.ts
@@ -0,0 +1,3 @@
+export const isValidMemoryValue = (value: unknown): value is number => {
+  return typeof value === 'number' && Number.isFinite(value) && value >= 0
+}
diff --git a/packages/process-explorer-worker/src/parts/MemoryAttribution/MemoryAttribution.ts b/packages/process-explorer-worker/src/parts/MemoryAttribution/MemoryAttribution.ts
new file mode 100644
index 0000000..286303b
--- /dev/null
+++ b/packages/process-explorer-worker/src/parts/MemoryAttribution/MemoryAttribution.ts
@@ -0,0 +1,4 @@
+export interface MemoryAttribution {
+  readonly scope?: string
+  readonly url?: string
+}
diff --git a/packages/process-explorer-worker/src/parts/MemoryBreakdownEntry/MemoryBreakdownEntry.ts b/packages/process-explorer-worker/src/parts/MemoryBreakdownEntry/MemoryBreakdownEntry.ts
new file mode 100644
index 0000000..acd7fb1
--- /dev/null
+++ b/packages/process-explorer-worker/src/parts/MemoryBreakdownEntry/MemoryBreakdownEntry.ts
@@ -0,0 +1,7 @@
+import type { MemoryAttribution } from '../MemoryAttribution/MemoryAttribution.ts'
+
+export interface MemoryBreakdownEntry {
+  readonly attribution?: readonly MemoryAttribution[]
+  readonly bytes: number
+  readonly types?: readonly string[]
+}
diff --git a/packages/process-explorer-worker/src/parts/MemoryMeasurement/MemoryMeasurement.ts b/packages/process-explorer-worker/src/parts/MemoryMeasurement/MemoryMeasurement.ts
new file mode 100644
index 0000000..eda1877
--- /dev/null
+++ b/packages/process-explorer-worker/src/parts/MemoryMeasurement/MemoryMeasurement.ts
@@ -0,0 +1,6 @@
+import type { MemoryBreakdownEntry } from '../MemoryBreakdownEntry/MemoryBreakdownEntry.ts'
+
+export interface MemoryMeasurement {
+  readonly breakdown?: readonly MemoryBreakdownEntry[]
+  readonly bytes: number
+}
diff --git a/packages/process-explorer-worker/src/parts/PerformanceWithMemory/PerformanceWithMemory.ts b/packages/process-explorer-worker/src/parts/PerformanceWithMemory/PerformanceWithMemory.ts
new file mode 100644
index 0000000..d808f20
--- /dev/null
+++ b/packages/process-explorer-worker/src/parts/PerformanceWithMemory/PerformanceWithMemory.ts
@@ -0,0 +1,5 @@
+import type { MemoryMeasurement } from '../MemoryMeasurement/MemoryMeasurement.ts'
+
+export interface PerformanceWithMemory extends Performance {
+  readonly measureUserAgentSpecificMemory?: () => Promise<MemoryMeasurement>
+}
diff --git a/packages/process-explorer-worker/src/parts/SendMessagePortToProcessExplorer/SendMessagePortToProcessExplorer.ts b/packages/process-explorer-worker/src/parts/SendMessagePortToProcessExplorer/SendMessagePortToProcessExplorer.ts
index 319cc1c..81b85c4 100644
--- a/packages/process-explorer-worker/src/parts/SendMessagePortToProcessExplorer/SendMessagePortToProcessExplorer.ts
+++ b/packages/process-explorer-worker/src/parts/SendMessagePortToProcessExplorer/SendMessagePortToProcessExplorer.ts
@@ -1,15 +1,7 @@
 import { RendererWorker } from '@lvce-editor/rpc-registry'
 
-interface RendererWorkerWithProcessExplorer {
-  readonly sendMessagePortToProcessExplorer: (
-    port: MessagePort,
-  ) => Promise<void>
-}
-
 export const sendMessagePortToProcessExplorer = async (
   port: MessagePort,
 ): Promise<void> => {
-  const rendererWorker =
-    RendererWorker as unknown as RendererWorkerWithProcessExplorer
-  await rendererWorker.sendMessagePortToProcessExplorer(port)
+  await RendererWorker.sendMessagePortToProcessExplorer(port)
 }
diff --git a/packages/process-explorer-worker/src/parts/ToBreakdownProcess/ToBreakdownProcess.ts b/packages/process-explorer-worker/src/parts/ToBreakdownProcess/ToBreakdownProcess.ts
new file mode 100644
index 0000000..8c08216
--- /dev/null
+++ b/packages/process-explorer-worker/src/parts/ToBreakdownProcess/ToBreakdownProcess.ts
@@ -0,0 +1,19 @@
+import type { MemoryBreakdownEntry } from '../MemoryBreakdownEntry/MemoryBreakdownEntry.ts'
+import type { ProcessInfo } from '../ProcessInfo/ProcessInfo.ts'
+import * as GetBreakdownName from '../GetBreakdownName/GetBreakdownName.ts'
+import * as WindowPid from '../WindowPid/WindowPid.ts'
+
+export const toBreakdownProcess = (
+  entry: MemoryBreakdownEntry,
+  index: number,
+): ProcessInfo => {
+  const name = GetBreakdownName.getBreakdownName(entry, index)
+  return {
+    cmd: name,
+    memory: entry.bytes,
+    name,
+    pid: -2 - index,
+    ppid: WindowPid.WindowPid,
+    synthetic: true,
+  }
+}
diff --git a/packages/process-explorer-worker/src/parts/WindowPid/WindowPid.ts b/packages/process-explorer-worker/src/parts/WindowPid/WindowPid.ts
new file mode 100644
index 0000000..9c46ca6
--- /dev/null
+++ b/packages/process-explorer-worker/src/parts/WindowPid/WindowPid.ts
@@ -0,0 +1 @@
+export const WindowPid = -1