diff --git a/.woodpecker/verify.yml b/.woodpecker/verify.yml
index 8ee56eb..60963a8 100644
--- a/.woodpecker/verify.yml
+++ b/.woodpecker/verify.yml
@@ -23,4 +23,5 @@ steps:
     environment:
       NUGET_PACKAGES: /home/justme/.nuget/packages
     commands:
-      - cd backend && dotnet test --solution MoShiro.slnx -c Release
+      # 增量编译 + 测试（把后端源码同步到固定目录，只重编译变了的项目），见 ci/verify-backend.sh
+      - bash ci/verify-backend.sh
diff --git a/.woodpecker/web-build.yml b/.woodpecker/web-build.yml
index 761fdaa..35d7bb4 100644
--- a/.woodpecker/web-build.yml
+++ b/.woodpecker/web-build.yml
@@ -13,15 +13,12 @@ when:
   - event: push
     branch: main
 
-depends_on:
-  - verify
-
+# 和 verify 并行：前端构建不依赖后端测试，两个同时跑
 steps:
   - name: web-build
     image: bash
     environment:
       NPM_CONFIG_CACHE: /home/justme/.npm
     commands:
-      - npm ci --prefix web --prefer-offline
-      - npm run build --prefix web
-      - npm run lint:css --prefix web
+      # node_modules 按锁文件哈希缓存，展示端和管理端并行构建，再检查 CSS，见 ci/web-build.sh
+      - bash ci/web-build.sh
diff --git a/ci/verify-backend.sh b/ci/verify-backend.sh
new file mode 100644
index 0000000..bbfdfb1
--- /dev/null
+++ b/ci/verify-backend.sh
@@ -0,0 +1,59 @@
+#!/usr/bin/env bash
+# 后端测试，带增量编译：把后端源码同步到一个固定目录，在那里 dotnet build / test。
+#
+# 为什么：每条流水线的工作区都是新克隆的（路径、文件时间都是新的），MSBuild 没法增量，每次从零编译整个解决方案要两分钟。
+# 固定目录里 obj/bin 留着，同步时只更新内容真的变了的文件（按内容比较，没变的文件时间不动），MSBuild 就只重编译受影响的项目；
+# 改动小的时候整个测试 20–30 秒。
+#
+# 同一时间只允许一条流水线用这份缓存（flock）；增量编译失败（缓存坏了）就清掉缓存从头编译一次，所以最坏也只是回到原来的速度。
+set -euo pipefail
+
+root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cache="${MOSHIRO_CI_CACHE:-/home/justme/woodpecker/cache/backend-tests}"
+src="$cache/src"
+mkdir -p "$cache"
+
+# .NET 第一次运行的欢迎信息、遥测、开发证书，在每条流水线的临时 HOME 里都要白做一遍
+export DOTNET_CLI_TELEMETRY_OPTOUT=1 DOTNET_NOLOGO=1 DOTNET_SKIP_FIRST_TIME_EXPERIENCE=1 DOTNET_GENERATE_ASPNET_CERTIFICATE=false
+
+exec 9> "$cache/.lock"
+flock -w 900 9 || { echo "could not get the backend test cache lock" >&2; exit 1; }
+
+sync_sources() {
+  mkdir -p "$src"
+  local list
+  list="$(mktemp)"
+  # 构建要用的都在 backend/ 和根目录的几个文件里（Directory.Packages.props、global.json、NuGet 配置）
+  (cd "$root" && git ls-files -z -- backend Directory.Packages.props global.json 'NuGet.*' 'nuget.*') | tr '\0' '\n' | sort -u > "$list"
+  local changed=0 file
+  while IFS= read -r file; do
+    [[ -f "$root/$file" ]] || continue
+    if ! cmp -s "$root/$file" "$src/$file" 2>/dev/null; then
+      mkdir -p "$(dirname "$src/$file")"
+      cp "$root/$file" "$src/$file"
+      changed=$((changed + 1))
+    fi
+  done < "$list"
+  # 仓库里已经删掉的文件，缓存里也要删（构建产物 artifacts 不动）
+  local stale=0
+  while IFS= read -r file; do
+    [[ -n "$file" ]] || continue
+    rm -f "$src/$file"
+    stale=$((stale + 1))
+  done < <(cd "$src" && find backend -type f -not -path 'backend/artifacts/*' -not -path '*/bin/*' -not -path '*/obj/*' 2>/dev/null | sort | comm -23 - <(grep '^backend/' "$list"))
+  rm -f "$list"
+  echo "synced sources: $changed changed, $stale removed"
+}
+
+build() { (cd "$src/backend" && dotnet build MoShiro.slnx -c Release --nologo -v:q); }
+
+sync_sources
+if ! build; then
+  echo "incremental build failed; wiping the cache and building from scratch" >&2
+  rm -rf "$src"
+  sync_sources
+  build
+fi
+
+# 测试在缓存目录里跑完整的解决方案（不再重复编译）
+(cd "$src/backend" && dotnet test --solution MoShiro.slnx -c Release --no-build)
diff --git a/ci/web-build.sh b/ci/web-build.sh
new file mode 100644
index 0000000..c0cfbb3
--- /dev/null
+++ b/ci/web-build.sh
@@ -0,0 +1,55 @@
+#!/usr/bin/env bash
+# 前端构建和 CSS 检查，带依赖缓存：node_modules 按「锁文件 + package.json」的哈希缓存起来，同样的依赖不再 npm ci（约 20 秒）；
+# 展示端和管理端并行构建。缓存里放的是硬链接副本（cp -al），恢复几乎是瞬间；依赖变了才重新安装并更新缓存，只留最近 3 份。
+set -euo pipefail
+
+root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cache="${MOSHIRO_CI_CACHE:-/home/justme/woodpecker/cache/web-node-modules}"
+export NPM_CONFIG_CACHE="${NPM_CONFIG_CACHE:-/home/justme/.npm}"
+web="$root/web"
+dirs=(node_modules display/node_modules admin/node_modules)
+mkdir -p "$cache"
+
+key="$(cat "$web/package-lock.json" "$web/package.json" "$web/display/package.json" "$web/admin/package.json" | sha256sum | cut -c1-16)"
+
+restore() {
+  [[ -d "$cache/$key/node_modules" ]] || return 1
+  local d
+  for d in "${dirs[@]}"; do
+    [[ -d "$cache/$key/$d" ]] || continue
+    mkdir -p "$(dirname "$web/$d")"
+    cp -al "$cache/$key/$d" "$web/$d" 2>/dev/null || cp -a "$cache/$key/$d" "$web/$d"
+  done
+}
+
+save() {
+  local tmp="$cache/$key.tmp.$$" d
+  rm -rf "$tmp"
+  for d in "${dirs[@]}"; do
+    [[ -d "$web/$d" ]] || continue
+    mkdir -p "$(dirname "$tmp/$d")"
+    cp -al "$web/$d" "$tmp/$d" 2>/dev/null || cp -a "$web/$d" "$tmp/$d"
+  done
+  rm -rf "$cache/$key"
+  mv "$tmp" "$cache/$key"
+  # 只留最近用过的 3 份
+  (cd "$cache" && ls -1t | grep -v '\.tmp\.' | tail -n +4 | xargs -r rm -rf)
+}
+
+if restore; then
+  echo "restored node_modules from the cache ($key)"
+else
+  echo "no cache for $key; running npm ci"
+  rm -rf "$web/node_modules" "$web/display/node_modules" "$web/admin/node_modules"
+  npm ci --prefix "$web" --prefer-offline
+  save || echo "could not save the node_modules cache" >&2
+fi
+
+# 展示端和管理端并行构建，再检查 CSS
+pids=()
+(cd "$web" && timeout 600 npm run build -w display) & pids+=($!)
+(cd "$web" && timeout 600 npm run build -w admin) & pids+=($!)
+failed=0
+for pid in "${pids[@]}"; do wait "$pid" || failed=1; done
+[[ "$failed" == 0 ]] || { echo "web build failed" >&2; exit 1; }
+npm run lint:css --prefix "$web"