diff --git a/.changeset/smart-tables-hammer.md b/.changeset/smart-tables-hammer.md
new file mode 100644
index 0000000000..7e2ec0cb49
--- /dev/null
+++ b/.changeset/smart-tables-hammer.md
@@ -0,0 +1,5 @@
+---
+"@pnpm/get-context": minor
+---
+
+Add `currentLockfileIsUpToDate` to the context.
diff --git a/.changeset/three-pens-clap.md b/.changeset/three-pens-clap.md
new file mode 100644
index 0000000000..daa9c2807c
--- /dev/null
+++ b/.changeset/three-pens-clap.md
@@ -0,0 +1,5 @@
+---
+"supi": patch
+---
+
+Fix current lockfile (the one at `node_modules/.pnpm/lock.yaml`) up-to-date check.
diff --git a/packages/get-context/src/index.ts b/packages/get-context/src/index.ts
index 1e5aab8064..0259581e6f 100644
--- a/packages/get-context/src/index.ts
+++ b/packages/get-context/src/index.ts
@@ -23,6 +23,7 @@ import readLockfileFile from './readLockfiles'
 
 export interface PnpmContext<T> {
   currentLockfile: Lockfile,
+  currentLockfileIsUpToDate: boolean,
   existsCurrentLockfile: boolean,
   existsWantedLockfile: boolean,
   extraBinPaths: string[],
@@ -292,6 +293,7 @@ function stringifyIncludedDeps (included: IncludedDependencies) {
 
 export interface PnpmSingleContext {
   currentLockfile: Lockfile,
+  currentLockfileIsUpToDate: boolean,
   existsCurrentLockfile: boolean,
   existsWantedLockfile: boolean,
   extraBinPaths: string[],
diff --git a/packages/get-context/src/readLockfiles.ts b/packages/get-context/src/readLockfiles.ts
index fdbd1c48ac..73b426ab16 100644
--- a/packages/get-context/src/readLockfiles.ts
+++ b/packages/get-context/src/readLockfiles.ts
@@ -35,6 +35,7 @@ export default async function (
   }
 ): Promise<{
   currentLockfile: Lockfile,
+  currentLockfileIsUpToDate: boolean,
   existsCurrentLockfile: boolean,
   existsWantedLockfile: boolean,
   wantedLockfile: Lockfile,
@@ -76,6 +77,7 @@ export default async function (
   }
   return {
     currentLockfile,
+    currentLockfileIsUpToDate: R.equals(currentLockfile, wantedLockfile),
     existsCurrentLockfile: !!files[1],
     existsWantedLockfile: !!files[0],
     wantedLockfile,
diff --git a/packages/supi/src/install/index.ts b/packages/supi/src/install/index.ts
index 6cdd9276cb..49e06e3ba9 100644
--- a/packages/supi/src/install/index.ts
+++ b/packages/supi/src/install/index.ts
@@ -64,7 +64,6 @@ import getWantedDependencies, {
   PinnedVersion,
   WantedDependency,
 } from './getWantedDependencies'
-import isCurrentLockfileUpToDate from './isCurrentLockfilesUpToDate'
 import linkPackages, {
   DependenciesGraph,
   DependenciesGraphNode,
@@ -389,24 +388,15 @@ export async function mutateModules (
       })
     }
 
-    const currentLockfileIsUpToDate = isCurrentLockfileUpToDate(
-      ctx.currentLockfile,
-      {
-        skipped: Array.from(ctx.skipped),
-        wantedLockfile: ctx.wantedLockfile,
-      }
-    )
     // Unfortunately, the private lockfile may differ from the public one.
     // A user might run named installations on a project that has a pnpm-lock.yaml file before running a noop install
     const makePartialCurrentLockfile = !installsOnly && (
       ctx.existsWantedLockfile && !ctx.existsCurrentLockfile ||
-      // TODO: this operation is quite expensive. We'll have to find a better solution to do this.
-      // maybe in pnpm v2 it won't be needed. See: https://github.com/pnpm/pnpm/issues/841
-      !currentLockfileIsUpToDate
+      !ctx.currentLockfileIsUpToDate
     )
     const result = await installInContext(projectsToInstall, ctx, {
       ...opts,
-      currentLockfileIsUpToDate: !ctx.existsWantedLockfile || currentLockfileIsUpToDate,
+      currentLockfileIsUpToDate: !ctx.existsWantedLockfile || ctx.currentLockfileIsUpToDate,
       makePartialCurrentLockfile,
       update: opts.update || !installsOnly,
       updateLockfileMinorVersion: true,
diff --git a/packages/supi/src/install/isCurrentLockfilesUpToDate.ts b/packages/supi/src/install/isCurrentLockfilesUpToDate.ts
deleted file mode 100644
index 956a94fe2f..0000000000
--- a/packages/supi/src/install/isCurrentLockfilesUpToDate.ts
+++ /dev/null
@@ -1,19 +0,0 @@
-import { Lockfile } from '@pnpm/lockfile-file'
-import R = require('ramda')
-
-export default function (
-  currentLockfile: Lockfile,
-  opts: {
-    skipped: string[],
-    wantedLockfile: Lockfile,
-  }
-) {
-  const importers1 = R.keys(opts.wantedLockfile.importers)
-  const importers2 = R.keys(currentLockfile.importers)
-  if (importers1.length !== importers2.length || !R.equals(importers1, importers2)) {
-    return false
-  }
-  const pkgs1 = R.keys(opts.wantedLockfile.packages)
-  const pkgs2 = R.keys(currentLockfile.packages).concat(opts.skipped)
-  return pkgs1.length === pkgs2.length && R.equals(pkgs1, pkgs2.sort())
-}