对xamarin forms 5的更新会导致调试超慢

从4.8升级到Xamarin Forms 5.0.0.2012会使应用程序（仅在调试模式下）在每次交互时冻结几秒钟，并产生大量输出：

Thread started: <Thread Pool> #41   
[Mono] GC_BRIDGE waiting for bridge processing to finish    
[Mono] GC_TAR_BRIDGE bridges 0 objects 0 opaque 0 colors 0 colors-bridged 0 colors-visible 169 xref 4 cache-hit 0 cache-semihit 0 cache-miss 0 setup 0.07ms tarjan 0.09ms scc-setup 0.06ms gather-xref 0.00ms xref-setup 0.00ms cleanup 0.00ms  
[Mono] GC_BRIDGE: Complete, was running for 0.05ms  
[Mono] GC_MINOR: (Nursery full) time 15.02ms, stw 18.82ms promoted 1445K major size: 33920K in use: 32001K los size: 9472K in use: 7121K    
Thread started: <Thread Pool> #42   
Thread started: <Thread Pool> #43   
Thread started: <Thread Pool> #44   
Thread started: <Thread Pool> #45   
Thread started: <Thread Pool> #46   
Thread started: <Thread Pool> #47   
Thread started: <Thread Pool> #48   
Thread started: <Thread Pool> #49   
Thread started: <Thread Pool> #50   
Thread started: <Thread Pool> #51   
[Mono] GC_BRIDGE waiting for bridge processing to finish    
[Mono] GC_TAR_BRIDGE bridges 0 objects 0 opaque 0 colors 0 colors-bridged 0 colors-visible 169 xref 4 cache-hit 0 cache-semihit 0 cache-miss 0 setup 0.07ms tarjan 0.09ms scc-setup 0.06ms gather-xref 0.00ms xref-setup 0.00ms cleanup 0.00ms  
[Mono] GC_BRIDGE: Complete, was running for 0.07ms  
[Mono] GC_MINOR: (Nursery full) time 11.92ms, stw 14.43ms promoted 926K major size: 34896K in use: 32961K los size: 12544K in use: 10620K   
[mono] Full thread dump:    
[Mono] GC_TAR_BRIDGE bridges 0 objects 0 opaque 0 colors 0 colors-bridged 0 colors-visible 169 xref 4 cache-hit 0 cache-semihit 0 cache-miss 0 setup 0.07ms tarjan 0.09ms scc-setup 0.06ms gather-xref 0.00ms xref-setup 0.00ms cleanup 0.00ms  
[Mono] GC_BRIDGE waiting for bridge processing to finish    
[Mono] GC_BRIDGE: Complete, was running for 0.07ms  
[Mono] GC_MINOR: (Nursery full) time 13.09ms, stw 15.10ms promoted 860K major size: 35728K in use: 33849K los size: 17664K in use: 15619K   
[Mono] GC_TAR_BRIDGE bridges 0 objects 0 opaque 0 colors 0 colors-bridged 0 colors-visible 169 xref 4 cache-hit 0 cache-semihit 0 cache-miss 0 setup 0.07ms tarjan 0.09ms scc-setup 0.06ms gather-xref 0.00ms xref-setup 0.00ms cleanup 0.00ms  
[Mono] GC_BRIDGE: Complete, was running for 0.07ms  
[Mono] GC_MINOR: (Concurrent start) time 3.81ms, stw 13.08ms promoted 1K major size: 35728K in use: 33851K los size: 17664K in use: 15619K  
[Mono] GC_MAJOR_CONCURRENT_START: (LOS overflow)    
[Mono] GC_BRIDGE waiting for bridge processing to finish

线程已启动：#41
[Mono]GC_桥接器正在等待桥接器处理完成
[Mono]GC_TAR_桥接0对象0不透明0颜色0颜色桥接0颜色可见169外部参照4缓存命中0缓存半命中0缓存未命中0设置0.07ms tarjan 0.09ms scc设置0.06ms聚集外部参照0.00ms外部参照设置0.00ms清理0.00ms
[Mono]GC_桥接器：已完成，正在运行0.05毫秒
[Mono]GC_小调：（托儿所全日制）时间15.02ms，stw 18.82ms提升1445K大调尺寸：33920K在用尺寸：32001K los尺寸：9472K在用尺寸：7121K
线程已启动：#42
线程已启动：#43
线程已启动：#44
线程已启动：#45
线程已启动：#46
线程已启动：#47
线程已启动：#48
线程已启动：#49
线程已启动：#50
线程已启动：#51
[Mono]GC_桥接器正在等待桥接器处理完成
[Mono]GC_TAR_桥接0对象0不透明0颜色0颜色桥接0颜色可见169外部参照4缓存命中0缓存半命中0缓存未命中0设置0.07ms tarjan 0.09ms scc设置0.06ms聚集外部参照0.00ms外部参照设置0.00ms清理0.00ms
[Mono]GC_桥接器：已完成，正在运行0.07毫秒
[Mono]GC_小调：（托儿所全职）时间11.92ms，stw 14.43ms升级926K大调尺寸：34896K使用中：32961K los尺寸：12544K使用中：10620K
[mono]全线程转储：
[Mono]GC_TAR_桥接0对象0不透明0颜色0颜色桥接0颜色可见169外部参照4缓存命中0缓存半命中0缓存未命中0设置0.07ms tarjan 0.09ms scc设置0.06ms聚集外部参照0.00ms外部参照设置0.00ms清理0.00ms
[Mono]GC_桥接器正在等待桥接器处理完成
[Mono]GC_桥接器：已完成，正在运行0.07毫秒
[Mono]GC_小调：（托儿所全日制）时间13.09ms，stw 15.10ms推广860K大调尺寸：35728K在用尺寸：33849K视轴尺寸：17664K在用尺寸：15619K
[Mono]GC_TAR_桥接0对象0不透明0颜色0颜色桥接0颜色可见169外部参照4缓存命中0缓存半命中0缓存未命中0设置0.07ms tarjan 0.09ms scc设置0.06ms聚集外部参照0.00ms外部参照设置0.00ms清理0.00ms
[Mono]GC_桥接器：已完成，正在运行0.07毫秒
[Mono]GC_小调：（同时启动）时间3.81ms，stw 13.08ms提升1K大调尺寸：35728K使用中：33851K服务水平尺寸：17664K使用中：15619K
[Mono]GC_主要_并发_开始：（服务水平溢出）
[Mono]GC_桥接器正在等待桥接器处理完成

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知道如何恢复调试器的可用性吗？

从ListView中删除CachingStrategy=“RecycleElement”是部分解决方案