diff --git a/debian/list.go b/debian/list.go
index 189448a9..5b767376 100644
--- a/debian/list.go
+++ b/debian/list.go
@@ -65,11 +65,13 @@ const (
 
 // VerifyDependencies looks for missing dependencies in package list.
 //
-// Analysis would be peformed for each architecture
+// Analysis would be peformed for each architecture, in specified sources
 func (l *PackageList) VerifyDependencies(options int, architectures []string, sources *PackageIndexedList) ([]Dependency, error) {
-	missing := make([]Dependency, 0, 100)
+	missing := make([]Dependency, 0, 128)
 
 	for _, arch := range architectures {
+		cache := make(map[string]bool, 2048)
+
 		for _, p := range l.packages {
 			if !p.MatchesArchitecture(arch) {
 				continue
@@ -83,8 +85,17 @@ func (l *PackageList) VerifyDependencies(options int, architectures []string, so
 
 				dep.Architecture = arch
 
-				if sources.Search(dep) != nil {
+				hash := dep.Hash()
+				_, ok := cache[hash]
+				if ok {
+					continue
+				}
+
+				if sources.Search(dep) == nil {
 					missing = append(missing, dep)
+					cache[hash] = false
+				} else {
+					cache[hash] = true
 				}
 			}
 		}
@@ -154,6 +165,49 @@ func (l *PackageIndexedList) Append(pl *PackageList) {
 
 // Search searches package index for specified package
 func (l *PackageIndexedList) Search(dep Dependency) *Package {
+	if dep.Relation == VersionDontCare {
+		for _, p := range l.providesList[dep.Pkg] {
+			if p.MatchesArchitecture(dep.Architecture) {
+				return p
+			}
+		}
+	}
+
+	i := sort.Search(len(l.packages), func(j int) bool { return l.packages[j].Name >= dep.Pkg })
+
+	for i < len(l.packages) && l.packages[i].Name == dep.Pkg {
+		p := l.packages[i]
+		if p.MatchesArchitecture(dep.Architecture) {
+			if dep.Relation == VersionDontCare {
+				return p
+			}
+
+			r := CompareVersions(p.Version, dep.Version)
+			switch dep.Relation {
+			case VersionEqual:
+				if r == 0 {
+					return p
+				}
+			case VersionLess:
+				if r < 0 {
+					return p
+				}
+			case VersionGreater:
+				if r > 0 {
+					return p
+				}
+			case VersionLessOrEqual:
+				if r <= 0 {
+					return p
+				}
+			case VersionGreaterOrEqual:
+				if r >= 0 {
+					return p
+				}
+			}
+		}
+		i++
+	}
 	return nil
 }
 
diff --git a/debian/list_test.go b/debian/list_test.go
index 5eb15904..fa686006 100644
--- a/debian/list_test.go
+++ b/debian/list_test.go
@@ -119,3 +119,79 @@ func (s *PackageListSuite) TestPackageRefListForeach(c *C) {
 
 	c.Check(err, Equals, e)
 }
+
+type PackageIndexedListSuite struct {
+	packages []*Package
+	pl       *PackageList
+	list     *PackageIndexedList
+}
+
+var _ = Suite(&PackageIndexedListSuite{})
+
+func (s *PackageIndexedListSuite) SetUpTest(c *C) {
+	s.pl = NewPackageList()
+	s.packages = []*Package{
+		&Package{Name: "lib", Version: "1.0", Architecture: "i386", PreDepends: []string{"dpkg (>= 1.6)"}, Depends: []string{"mail-agent"}},
+		&Package{Name: "dpkg", Version: "1.7", Architecture: "i386"},
+		&Package{Name: "data", Version: "1.1~bp1", Architecture: "all", PreDepends: []string{"dpkg (>= 1.6)"}},
+		&Package{Name: "app", Version: "1.1~bp1", Architecture: "i386", PreDepends: []string{"dpkg (>= 1.6)"}, Depends: []string{"lib (>> 0.9)", "data (>= 1.0)"}},
+		&Package{Name: "mailer", Version: "3.5.8", Architecture: "i386", Provides: "mail-agent"},
+		&Package{Name: "app", Version: "1.1~bp1", Architecture: "amd64", PreDepends: []string{"dpkg (>= 1.6)"}, Depends: []string{"lib (>> 0.9)", "data (>= 1.0)"}},
+		&Package{Name: "app", Version: "1.1~bp1", Architecture: "arm", PreDepends: []string{"dpkg (>= 1.6)"}, Depends: []string{"lib (>> 0.9)", "data (>= 1.0)"}},
+		&Package{Name: "app", Version: "1.0", Architecture: "s390", PreDepends: []string{"dpkg >= 1.6)"}, Depends: []string{"lib (>> 0.9)", "data (>= 1.0)"}},
+		&Package{Name: "aa", Version: "2.0-1", Architecture: "i386", PreDepends: []string{"dpkg (>= 1.6)"}},
+		&Package{Name: "dpkg", Version: "1.6.1-3", Architecture: "amd64"},
+	}
+	for _, p := range s.packages {
+		s.pl.Add(p)
+	}
+
+	s.list = NewPackageIndexedList()
+	s.list.Append(s.pl)
+	s.list.PrepareIndex()
+}
+
+func (s *PackageIndexedListSuite) TestIndex(c *C) {
+	c.Check(len(s.list.providesList), Equals, 1)
+	c.Check(len(s.list.providesList["mail-agent"]), Equals, 1)
+	c.Check(s.list.packages[0], Equals, s.packages[8])
+}
+
+func (s *PackageIndexedListSuite) TestSearch(c *C) {
+	c.Check(s.list.Search(Dependency{Architecture: "i386", Pkg: "app"}), Equals, s.packages[3])
+	c.Check(s.list.Search(Dependency{Architecture: "i386", Pkg: "mail-agent"}), Equals, s.packages[4])
+	c.Check(s.list.Search(Dependency{Architecture: "i386", Pkg: "puppy"}), IsNil)
+
+	c.Check(s.list.Search(Dependency{Architecture: "i386", Pkg: "app", Relation: VersionEqual, Version: "1.1~bp1"}), Equals, s.packages[3])
+	c.Check(s.list.Search(Dependency{Architecture: "i386", Pkg: "app", Relation: VersionEqual, Version: "1.1~bp2"}), IsNil)
+
+	c.Check(s.list.Search(Dependency{Architecture: "i386", Pkg: "app", Relation: VersionLess, Version: "1.1"}), Equals, s.packages[3])
+	c.Check(s.list.Search(Dependency{Architecture: "i386", Pkg: "app", Relation: VersionLess, Version: "1.1~~"}), IsNil)
+
+	c.Check(s.list.Search(Dependency{Architecture: "i386", Pkg: "app", Relation: VersionLessOrEqual, Version: "1.1"}), Equals, s.packages[3])
+	c.Check(s.list.Search(Dependency{Architecture: "i386", Pkg: "app", Relation: VersionLessOrEqual, Version: "1.1~bp1"}), Equals, s.packages[3])
+	c.Check(s.list.Search(Dependency{Architecture: "i386", Pkg: "app", Relation: VersionLessOrEqual, Version: "1.1~~"}), IsNil)
+
+	c.Check(s.list.Search(Dependency{Architecture: "i386", Pkg: "app", Relation: VersionGreater, Version: "1.0"}), Equals, s.packages[3])
+	c.Check(s.list.Search(Dependency{Architecture: "i386", Pkg: "app", Relation: VersionGreater, Version: "1.2"}), IsNil)
+
+	c.Check(s.list.Search(Dependency{Architecture: "i386", Pkg: "app", Relation: VersionGreaterOrEqual, Version: "1.0"}), Equals, s.packages[3])
+	c.Check(s.list.Search(Dependency{Architecture: "i386", Pkg: "app", Relation: VersionGreaterOrEqual, Version: "1.1~bp1"}), Equals, s.packages[3])
+	c.Check(s.list.Search(Dependency{Architecture: "i386", Pkg: "app", Relation: VersionGreaterOrEqual, Version: "1.2"}), IsNil)
+}
+
+func (s *PackageIndexedListSuite) TestVerifyDependencies(c *C) {
+	missing, err := s.pl.VerifyDependencies(0, []string{"i386"}, s.list)
+
+	c.Check(err, IsNil)
+	c.Check(missing, DeepEquals, []Dependency{})
+
+	missing, err = s.pl.VerifyDependencies(0, []string{"i386", "amd64"}, s.list)
+
+	c.Check(err, IsNil)
+	c.Check(missing, DeepEquals, []Dependency{Dependency{Pkg: "lib", Relation: VersionGreater, Version: "0.9", Architecture: "amd64"}})
+
+	_, err = s.pl.VerifyDependencies(0, []string{"i386", "amd64", "s390"}, s.list)
+
+	c.Check(err, ErrorMatches, "unable to process package app-1.0_s390:.*")
+}
diff --git a/debian/version.go b/debian/version.go
index b3203f56..74996725 100644
--- a/debian/version.go
+++ b/debian/version.go
@@ -188,6 +188,11 @@ type Dependency struct {
 	Architecture string
 }
 
+// Hash calculates some predefined unique ID of Dependency
+func (d *Dependency) Hash() string {
+	return fmt.Sprintf("%s:%s:%d:%s", d.Architecture, d.Pkg, d.Relation, d.Version)
+}
+
 // parseDependency parses dependency in format "pkg (>= 1.35)" into parts
 func parseDependency(dep string) (d Dependency, err error) {
 	if !strings.HasSuffix(dep, ")") {